recipes.cfg: roll to current recipe_engine.

BUG=None
TEST=generate

Change-Id: Iee4ef23dcaeae9d65a54b5fb4fda32634294134a
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/infra/proto/+/2401452
Commit-Queue: LaMont Jones <lamontjones@chromium.org>
Commit-Queue: Mike Nichols <mikenichols@chromium.org>
Tested-by: LaMont Jones <lamontjones@chromium.org>
Auto-Submit: LaMont Jones <lamontjones@chromium.org>
Reviewed-by: Mike Nichols <mikenichols@chromium.org>
diff --git a/infra/config/recipes.cfg b/infra/config/recipes.cfg
index 2937e1f..d6b9fdc 100644
--- a/infra/config/recipes.cfg
+++ b/infra/config/recipes.cfg
@@ -21,7 +21,7 @@
     },
     "recipe_engine": {
       "branch": "refs/heads/master",
-      "revision": "5d50d5f744305222468fed128a8b369ce873ce19",
+      "revision": "947bd8d8a407054baf1e0074c818d0620d32cf1d",
       "url": "https://chromium.googlesource.com/infra/luci/recipes-py.git"
     }
   },