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/84d216aab872ff9d2ea18a39620fec428ea38e57 Revert of [autoroller] All commits in updates(), only roll interesting ones. (patchset #3 id:40001 of https://codereview.chromium.org/2833723003/ ) (iannucci@google.com)


TBR=iannucci@chromium.org

Change-Id: Ia684930202e414b46c1a5ab45f5d1e1ee8374ba9
Recipe-Tryjob-Bypass-Reason: Autoroller
Bugdroid-Send-Email: False
Reviewed-on: https://chromium-review.googlesource.com/483742
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": "30925bd08c1f78e835f04a2a3d409cf027cde55e",
+      "revision": "84d216aab872ff9d2ea18a39620fec428ea38e57",
       "url": "https://chromium.googlesource.com/external/github.com/luci/recipes-py.git"
     }
   },