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/979fa780ce2f41fe9a3d89d74d9e8e69f88cd71d depot_tools: Make gclient_scm Python 3 compatible. (ehmaldonado@chromium.org)
recipe_engine:
  https://crrev.com/83800d1aff85a6bfa6b5202485c8a26b44701ff5 Regenerate README from 3fd5281 (iannucci@chromium.org)


TBR=borenet@google.com

Recipe-Tryjob-Bypass-Reason: Autoroller
Bugdroid-Send-Email: False
Change-Id: I89cec6c8a99cadf3469d8e07898b982b8898f40b
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/234437
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

@@ -14,12 +14,12 @@
   "deps": {
     "depot_tools": {
       "branch": "master",
-      "revision": "6bb29da82994c6e57ec3f5687e263affa11e6fd4",
+      "revision": "979fa780ce2f41fe9a3d89d74d9e8e69f88cd71d",
       "url": "https://chromium.googlesource.com/chromium/tools/depot_tools.git"
     },
     "recipe_engine": {
       "branch": "master",
-      "revision": "e7fec5ccb9e70bf17b7878e63052a874afa06856",
+      "revision": "83800d1aff85a6bfa6b5202485c8a26b44701ff5",
       "url": "https://chromium.googlesource.com/infra/luci/recipes-py.git"
     }
   },