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/a64a4d4ad8e4844cb81868a2b24df4d836d5caca [file] No error in remove if file does not exist (iannucci@chromium.org)


TBR=iannucci@chromium.org

Recipe-Tryjob-Bypass-Reason: Autoroller
Bugdroid-Send-Email: False
Change-Id: Ie865339d6d6b8495a0ab737905f3236e006603b9
Reviewed-on: https://chromium-review.googlesource.com/523183
Reviewed-by: Recipe Roller <recipe-roller@chromium.org>
Commit-Queue: Recipe Roller <recipe-roller@chromium.org>

infra/config/recipes.cfg

@@ -15,7 +15,7 @@
   "deps": {
     "recipe_engine": {
       "branch": "master",
-      "revision": "e7ce42597641397a594380f0d5edd6fd7ade1037",
+      "revision": "a64a4d4ad8e4844cb81868a2b24df4d836d5caca",
       "url": "https://chromium.googlesource.com/external/github.com/luci/recipes-py.git"
     }
   },