Roll recipe dependencies (trivial).

This is an automated CL created by the recipe roller. This CL rolls recipe
changes from upstream projects (e.g. depot_tools) into downstream projects
(e.g. tools/build).


More info is at https://goo.gl/zkKdpD. Use https://goo.gl/noib3a to file a bug.
recipe_engine:
  https://crrev.com/83831a2405589f70218ae8592d5fcd1bf40c8097 [fetch] Make GitBackend._execute log at info level (iannucci@chromium.org)


TBR=iannucci@chromium.org

Change-Id: I3a453dc21f0f1a8d46f82301a524f21b3ab65ca5
Recipe-Tryjob-Bypass-Reason: Autoroller
Bugdroid-Send-Email: False
Reviewed-on: https://chromium-review.googlesource.com/484080
Reviewed-by: <recipe-roller@chromium.org>
Commit-Queue: <recipe-roller@chromium.org>

infra/config/recipes.cfg

@@ -15,7 +15,7 @@
   "deps": {
     "recipe_engine": {
       "branch": "master",
-      "revision": "51e6ae23f698f81136bc508f633588354b5969ca",
+      "revision": "83831a2405589f70218ae8592d5fcd1bf40c8097",
       "url": "https://chromium.googlesource.com/external/github.com/luci/recipes-py.git"
     }
   },