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.
depot_tools:
  https://crrev.com/a81450253f8880c27e2859f271fa6fe00c6c7104 depot_tools: Use mock from vpython (or unittest.mock) instead of third_party/mock (ehmaldonado@google.com)


TBR=borenet@google.com

Recipe-Tryjob-Bypass-Reason: Autoroller
Bugdroid-Send-Email: False
Change-Id: Ib28607c0206a632641312b0b9ffc896527681b9a
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/262376
Reviewed-by: Recipe Roller <recipe-mega-autoroller@chops-service-accounts.iam.gserviceaccount.com>
Commit-Queue: Recipe Roller <recipe-mega-autoroller@chops-service-accounts.iam.gserviceaccount.com>

infra/config/recipes.cfg

@@ -14,7 +14,7 @@
   "deps": {
     "depot_tools": {
       "branch": "master",
-      "revision": "ed0cc5f6fd8ee57e9219f840d492de3109ba6d83",
+      "revision": "a81450253f8880c27e2859f271fa6fe00c6c7104",
       "url": "https://chromium.googlesource.com/chromium/tools/depot_tools.git"
     },
     "recipe_engine": {