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/767024c68dfec7d1047309cc319db36a4297d126 Revert "[gclient] Make getdep and setdep to provide builtin vars" (sergiyb@chromium.org)
  https://crrev.com/c6ffd7af7d84ec354a92a0dc11613ec23cf82c60 Include ARM64 bits into win_toolchain/package_from_installed.py (brucedawson@chromium.org)


TBR=borenet@google.com

Recipe-Tryjob-Bypass-Reason: Autoroller
Bugdroid-Send-Email: False
Change-Id: If1f633264b5c29a2a827792a5652fbaf889bba20
Reviewed-on: https://skia-review.googlesource.com/c/171649
Reviewed-by: Recipe Roller <recipe-roller@chromium.org>
Reviewed-by: Sergiy Byelozyorov <sergiyb@chromium.org>
Commit-Queue: Recipe Roller <recipe-roller@chromium.org>

infra/config/recipes.cfg

@@ -14,7 +14,7 @@
   "deps": {
     "depot_tools": {
       "branch": "master",
-      "revision": "801b5ddb145f189f301bc824a6b1ac9c109d480e",
+      "revision": "c6ffd7af7d84ec354a92a0dc11613ec23cf82c60",
       "url": "https://chromium.googlesource.com/chromium/tools/depot_tools.git"
     },
     "recipe_engine": {