Roll recipe dependencies (trivial).

This is an automated CL created by the recipe roller. This CL rolls
recipe changes from upstream projects (recipe_engine) into this repository.

recipe_engine:
https://chromium.googlesource.com/infra/luci/recipes-py.git/+log/86c55e698c80adc9d26af56e398081d8cb773464~..e039848b6795370d305f6dababc5af4047c15dab
  86c55e6 (bryner@google.com)
      Explicitly run python2 from recipes.py.
  e039848 (yiwzhang@google.com)
      recipe-proto: Roll proto imported from luci-go to latest

More info is at https://goo.gl/zkKdpD. Use https://goo.gl/noib3a to file a bug.

R=iannucci@chromium.org, tandrii@google.com

Recipe-Tryjob-Bypass-Reason: Autoroller
Bugdroid-Send-Email: False
Change-Id: Ibccb38b58a2e77193c0f963f118067648d657253
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/2774529
Bot-Commit: Recipe Roller <recipe-mega-autoroller@chops-service-accounts.iam.gserviceaccount.com>
Commit-Queue: Robbie Iannucci <iannucci@chromium.org>
Reviewed-by: Robbie Iannucci <iannucci@chromium.org>
diff --git a/infra/config/recipes.cfg b/infra/config/recipes.cfg
index ebe7f66..bc91731 100644
--- a/infra/config/recipes.cfg
+++ b/infra/config/recipes.cfg
@@ -16,7 +16,7 @@
   "deps": {
     "recipe_engine": {
       "branch": "master",
-      "revision": "c6627c1d2201fd582e7ca4b777c4749798d6c4db",
+      "revision": "e039848b6795370d305f6dababc5af4047c15dab",
       "url": "https://chromium.googlesource.com/infra/luci/recipes-py.git"
     }
   },
diff --git a/recipes/README.recipes.md b/recipes/README.recipes.md
index 92e91fc..0cb1278 100644
--- a/recipes/README.recipes.md
+++ b/recipes/README.recipes.md
@@ -1102,23 +1102,23 @@
 
 &mdash; **def [RunSteps](/recipes/recipe_modules/windows_sdk/examples/full.py#13)(api):**
 
-[recipe_engine/recipe_modules/assertions]: https://chromium.googlesource.com/infra/luci/recipes-py.git/+/c6627c1d2201fd582e7ca4b777c4749798d6c4db/README.recipes.md#recipe_modules-assertions
-[recipe_engine/recipe_modules/buildbucket]: https://chromium.googlesource.com/infra/luci/recipes-py.git/+/c6627c1d2201fd582e7ca4b777c4749798d6c4db/README.recipes.md#recipe_modules-buildbucket
-[recipe_engine/recipe_modules/cipd]: https://chromium.googlesource.com/infra/luci/recipes-py.git/+/c6627c1d2201fd582e7ca4b777c4749798d6c4db/README.recipes.md#recipe_modules-cipd
-[recipe_engine/recipe_modules/commit_position]: https://chromium.googlesource.com/infra/luci/recipes-py.git/+/c6627c1d2201fd582e7ca4b777c4749798d6c4db/README.recipes.md#recipe_modules-commit_position
-[recipe_engine/recipe_modules/context]: https://chromium.googlesource.com/infra/luci/recipes-py.git/+/c6627c1d2201fd582e7ca4b777c4749798d6c4db/README.recipes.md#recipe_modules-context
-[recipe_engine/recipe_modules/cq]: https://chromium.googlesource.com/infra/luci/recipes-py.git/+/c6627c1d2201fd582e7ca4b777c4749798d6c4db/README.recipes.md#recipe_modules-cq
-[recipe_engine/recipe_modules/file]: https://chromium.googlesource.com/infra/luci/recipes-py.git/+/c6627c1d2201fd582e7ca4b777c4749798d6c4db/README.recipes.md#recipe_modules-file
-[recipe_engine/recipe_modules/json]: https://chromium.googlesource.com/infra/luci/recipes-py.git/+/c6627c1d2201fd582e7ca4b777c4749798d6c4db/README.recipes.md#recipe_modules-json
-[recipe_engine/recipe_modules/milo]: https://chromium.googlesource.com/infra/luci/recipes-py.git/+/c6627c1d2201fd582e7ca4b777c4749798d6c4db/README.recipes.md#recipe_modules-milo
-[recipe_engine/recipe_modules/path]: https://chromium.googlesource.com/infra/luci/recipes-py.git/+/c6627c1d2201fd582e7ca4b777c4749798d6c4db/README.recipes.md#recipe_modules-path
-[recipe_engine/recipe_modules/platform]: https://chromium.googlesource.com/infra/luci/recipes-py.git/+/c6627c1d2201fd582e7ca4b777c4749798d6c4db/README.recipes.md#recipe_modules-platform
-[recipe_engine/recipe_modules/properties]: https://chromium.googlesource.com/infra/luci/recipes-py.git/+/c6627c1d2201fd582e7ca4b777c4749798d6c4db/README.recipes.md#recipe_modules-properties
-[recipe_engine/recipe_modules/python]: https://chromium.googlesource.com/infra/luci/recipes-py.git/+/c6627c1d2201fd582e7ca4b777c4749798d6c4db/README.recipes.md#recipe_modules-python
-[recipe_engine/recipe_modules/raw_io]: https://chromium.googlesource.com/infra/luci/recipes-py.git/+/c6627c1d2201fd582e7ca4b777c4749798d6c4db/README.recipes.md#recipe_modules-raw_io
-[recipe_engine/recipe_modules/resultdb]: https://chromium.googlesource.com/infra/luci/recipes-py.git/+/c6627c1d2201fd582e7ca4b777c4749798d6c4db/README.recipes.md#recipe_modules-resultdb
-[recipe_engine/recipe_modules/runtime]: https://chromium.googlesource.com/infra/luci/recipes-py.git/+/c6627c1d2201fd582e7ca4b777c4749798d6c4db/README.recipes.md#recipe_modules-runtime
-[recipe_engine/recipe_modules/step]: https://chromium.googlesource.com/infra/luci/recipes-py.git/+/c6627c1d2201fd582e7ca4b777c4749798d6c4db/README.recipes.md#recipe_modules-step
-[recipe_engine/recipe_modules/url]: https://chromium.googlesource.com/infra/luci/recipes-py.git/+/c6627c1d2201fd582e7ca4b777c4749798d6c4db/README.recipes.md#recipe_modules-url
-[recipe_engine/recipe_modules/version]: https://chromium.googlesource.com/infra/luci/recipes-py.git/+/c6627c1d2201fd582e7ca4b777c4749798d6c4db/README.recipes.md#recipe_modules-version
-[recipe_engine/wkt/RecipeApi]: https://chromium.googlesource.com/infra/luci/recipes-py.git/+/c6627c1d2201fd582e7ca4b777c4749798d6c4db/recipe_engine/recipe_api.py#875
+[recipe_engine/recipe_modules/assertions]: https://chromium.googlesource.com/infra/luci/recipes-py.git/+/e039848b6795370d305f6dababc5af4047c15dab/README.recipes.md#recipe_modules-assertions
+[recipe_engine/recipe_modules/buildbucket]: https://chromium.googlesource.com/infra/luci/recipes-py.git/+/e039848b6795370d305f6dababc5af4047c15dab/README.recipes.md#recipe_modules-buildbucket
+[recipe_engine/recipe_modules/cipd]: https://chromium.googlesource.com/infra/luci/recipes-py.git/+/e039848b6795370d305f6dababc5af4047c15dab/README.recipes.md#recipe_modules-cipd
+[recipe_engine/recipe_modules/commit_position]: https://chromium.googlesource.com/infra/luci/recipes-py.git/+/e039848b6795370d305f6dababc5af4047c15dab/README.recipes.md#recipe_modules-commit_position
+[recipe_engine/recipe_modules/context]: https://chromium.googlesource.com/infra/luci/recipes-py.git/+/e039848b6795370d305f6dababc5af4047c15dab/README.recipes.md#recipe_modules-context
+[recipe_engine/recipe_modules/cq]: https://chromium.googlesource.com/infra/luci/recipes-py.git/+/e039848b6795370d305f6dababc5af4047c15dab/README.recipes.md#recipe_modules-cq
+[recipe_engine/recipe_modules/file]: https://chromium.googlesource.com/infra/luci/recipes-py.git/+/e039848b6795370d305f6dababc5af4047c15dab/README.recipes.md#recipe_modules-file
+[recipe_engine/recipe_modules/json]: https://chromium.googlesource.com/infra/luci/recipes-py.git/+/e039848b6795370d305f6dababc5af4047c15dab/README.recipes.md#recipe_modules-json
+[recipe_engine/recipe_modules/milo]: https://chromium.googlesource.com/infra/luci/recipes-py.git/+/e039848b6795370d305f6dababc5af4047c15dab/README.recipes.md#recipe_modules-milo
+[recipe_engine/recipe_modules/path]: https://chromium.googlesource.com/infra/luci/recipes-py.git/+/e039848b6795370d305f6dababc5af4047c15dab/README.recipes.md#recipe_modules-path
+[recipe_engine/recipe_modules/platform]: https://chromium.googlesource.com/infra/luci/recipes-py.git/+/e039848b6795370d305f6dababc5af4047c15dab/README.recipes.md#recipe_modules-platform
+[recipe_engine/recipe_modules/properties]: https://chromium.googlesource.com/infra/luci/recipes-py.git/+/e039848b6795370d305f6dababc5af4047c15dab/README.recipes.md#recipe_modules-properties
+[recipe_engine/recipe_modules/python]: https://chromium.googlesource.com/infra/luci/recipes-py.git/+/e039848b6795370d305f6dababc5af4047c15dab/README.recipes.md#recipe_modules-python
+[recipe_engine/recipe_modules/raw_io]: https://chromium.googlesource.com/infra/luci/recipes-py.git/+/e039848b6795370d305f6dababc5af4047c15dab/README.recipes.md#recipe_modules-raw_io
+[recipe_engine/recipe_modules/resultdb]: https://chromium.googlesource.com/infra/luci/recipes-py.git/+/e039848b6795370d305f6dababc5af4047c15dab/README.recipes.md#recipe_modules-resultdb
+[recipe_engine/recipe_modules/runtime]: https://chromium.googlesource.com/infra/luci/recipes-py.git/+/e039848b6795370d305f6dababc5af4047c15dab/README.recipes.md#recipe_modules-runtime
+[recipe_engine/recipe_modules/step]: https://chromium.googlesource.com/infra/luci/recipes-py.git/+/e039848b6795370d305f6dababc5af4047c15dab/README.recipes.md#recipe_modules-step
+[recipe_engine/recipe_modules/url]: https://chromium.googlesource.com/infra/luci/recipes-py.git/+/e039848b6795370d305f6dababc5af4047c15dab/README.recipes.md#recipe_modules-url
+[recipe_engine/recipe_modules/version]: https://chromium.googlesource.com/infra/luci/recipes-py.git/+/e039848b6795370d305f6dababc5af4047c15dab/README.recipes.md#recipe_modules-version
+[recipe_engine/wkt/RecipeApi]: https://chromium.googlesource.com/infra/luci/recipes-py.git/+/e039848b6795370d305f6dababc5af4047c15dab/recipe_engine/recipe_api.py#875
diff --git a/recipes/recipes.py b/recipes/recipes.py
index 4339ba3..9804a4c 100755
--- a/recipes/recipes.py
+++ b/recipes/recipes.py
@@ -6,12 +6,12 @@
 # We want to run python in unbuffered mode; however shebangs on linux grab the
 # entire rest of the shebang line as a single argument, leading to errors like:
 #
-#   /usr/bin/env: 'python -u': No such file or directory
+#   /usr/bin/env: 'python2 -u': No such file or directory
 #
 # This little shell hack is a triple-quoted noop in python, but in sh it
 # evaluates to re-exec'ing this script in unbuffered mode.
 # pylint: disable=pointless-string-statement
-''''exec python -u -- "$0" ${1+"$@"} # '''
+''''exec python2 -u -- "$0" ${1+"$@"} # '''
 # vi: syntax=python
 """Bootstrap script to clone and forward to the recipe engine tool.