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/192e8a67cfe4d1b7b0cb8e70b12b5a45f7a9221d subprocess2: Rewrite tests to be Python 3 compatible. (ehmaldonado@chromium.org)
  https://crrev.com/d6186f993681ad1862236fb895dd4efb2f132bce depot_tools: Run Python scripts using vpython (Part 1) (ehmaldonado@chromium.org)


TBR=borenet@google.com

Recipe-Tryjob-Bypass-Reason: Autoroller
Bugdroid-Send-Email: False
Change-Id: I8918ba7949d6886229f0e9c1d5ac32e5cc815acc
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/234017
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>
diff --git a/infra/config/recipes.cfg b/infra/config/recipes.cfg
index 86a7bfe..e0c53e5 100644
--- a/infra/config/recipes.cfg
+++ b/infra/config/recipes.cfg
@@ -14,7 +14,7 @@
   "deps": {
     "depot_tools": {
       "branch": "master",
-      "revision": "b4fc338b7e806598991f894e2baa72e2f2d3a59e",
+      "revision": "d6186f993681ad1862236fb895dd4efb2f132bce",
       "url": "https://chromium.googlesource.com/chromium/tools/depot_tools.git"
     },
     "recipe_engine": {