Roll recipe dependencies (trivial).

This is an automated CL created by the recipe roller. This CL rolls recipe
changes from upstream projects (depot_tools) into this repository.

depot_tools:
  https://crrev.com/56c9bd5a73595d6ee86bf53dcb995e97f0fe6366 (vapier@chromium.org)
    repo: update to 2.4 launcher

More info is at https://goo.gl/zkKdpD. Use https://goo.gl/noib3a to file a bug.

TBR=borenet@google.com

Recipe-Tryjob-Bypass-Reason: Autoroller
Bugdroid-Send-Email: False
Change-Id: I93898b01185be17dd92886189a550fb30c4b5602
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/272141
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>

Author: recipe-roller

infra/config/recipes.cfg

@@ -14,7 +14,7 @@
   "deps": {
     "depot_tools": {
       "branch": "master",
-      "revision": "7677e5ccc06bde3297fb0475bf96d8cf88f8b4e9",
+      "revision": "56c9bd5a73595d6ee86bf53dcb995e97f0fe6366",
       "url": "https://chromium.googlesource.com/chromium/tools/depot_tools.git"
     },
     "recipe_engine": {