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/156ac81c761820125051bd09a6c4d7fcd8c49c4f Revert "Remove unused bootstrap flags" (sergiyb@chromium.org)


TBR=borenet@google.com

Recipe-Tryjob-Bypass-Reason: Autoroller
Bugdroid-Send-Email: False
Change-Id: Ic6138b73756332a4dafc471ff531787109f222ae
Reviewed-on: https://skia-review.googlesource.com/c/184441
Reviewed-by: Recipe Roller <recipe-roller@chromium.org>
Reviewed-by: Sergiy Belozorov <sergiyb@chromium.org>
Commit-Queue: Recipe Roller <recipe-roller@chromium.org>

infra/config/recipes.cfg

@@ -14,12 +14,12 @@
   "deps": {
     "depot_tools": {
       "branch": "master",
-      "revision": "8df62ef402195294d6c36a7a40601eb40f2a88b1",
+      "revision": "4d9f86da4d62dfe19c774012f02c3713cf63aa7f",
       "url": "https://chromium.googlesource.com/chromium/tools/depot_tools.git"
     },
     "recipe_engine": {
       "branch": "master",
-      "revision": "9722f43a7d840356c83cc6e36a494761897c6994",
+      "revision": "156ac81c761820125051bd09a6c4d7fcd8c49c4f",
       "url": "https://chromium.googlesource.com/infra/luci/recipes-py.git"
     }
   },