Roll recipe dependencies (trivial).

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

chromiumos_config:
https://chromium.googlesource.com/chromiumos/config.git/+/af103a37f99a12e9b6aa2bea0818ce799d15c6a8
  af103a3 (nartemiev@google.com)
      Set form-factor field in hardware-properties for all form factors

recipe_engine:
https://chromium.googlesource.com/infra/luci/recipes-py.git/+log/0dfd500e7b91f883ce716ead0b3c0a9dae0ad669~..9e63c4c60a1eb5b7db07f8e12593b6c3975b9a5e
  0dfd500 (chanli@chromium.org)
      [ResultDB] wrap: add require_build_inv flag
  9e63c4c (bryner@google.com)
      Fix recipes.py on Windows.

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

R=pprabhu@chromium.org

Recipe-Tryjob-Bypass-Reason: Autoroller
Bugdroid-Send-Email: False
Change-Id: I4e80cac61f73fd904b1c6dba181250a5b2cf41a0
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/infra/proto/+/2745655
Commit-Queue: Recipe Roller <recipe-mega-autoroller@chops-service-accounts.iam.gserviceaccount.com>
Bot-Commit: Recipe Roller <recipe-mega-autoroller@chops-service-accounts.iam.gserviceaccount.com>
diff --git a/infra/config/recipes.cfg b/infra/config/recipes.cfg
index 81d4424..0baf8de 100644
--- a/infra/config/recipes.cfg
+++ b/infra/config/recipes.cfg
@@ -16,12 +16,12 @@
   "deps": {
     "chromiumos_config": {
       "branch": "refs/heads/main",
-      "revision": "1f6833012cac6575cc13d0132a499245cbb72ff7",
+      "revision": "d81647833becfcd927b6c6996753b1df2df42b36",
       "url": "https://chromium.googlesource.com/chromiumos/config.git"
     },
     "recipe_engine": {
       "branch": "refs/heads/master",
-      "revision": "b0005c750146f4b802849924f328cb9c7f02f165",
+      "revision": "9e63c4c60a1eb5b7db07f8e12593b6c3975b9a5e",
       "url": "https://chromium.googlesource.com/infra/luci/recipes-py.git"
     }
   },
diff --git a/recipes/recipes.py b/recipes/recipes.py
index 32e497c..4339ba3 100755
--- a/recipes/recipes.py
+++ b/recipes/recipes.py
@@ -251,6 +251,7 @@
   if IS_WIN:
     # No real 'exec' on windows; set these signals to ignore so that they
     # propagate to our children but we still wait for the child process to quit.
+    import signal
     signal.signal(signal.SIGBREAK, signal.SIG_IGN)
     signal.signal(signal.SIGINT, signal.SIG_IGN)
     signal.signal(signal.SIGTERM, signal.SIG_IGN)