Roll recipe dependencies (trivial).

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

build:
  https://crrev.com/a8902e9d78723e01f92e4cd7fb4d1601adc38430 (tikuta@chromium.org)
    [chromium_tests] enable cas for linux-rel-swarming builder
  https://crrev.com/4a8addf20958de09e66c3d0eec850580ffb54e1a (tikuta@chromium.org)
    [isolate] remove clean_isolated_files step and find_isolated_tests.py

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

TBR=fujino@google.com

Recipe-Tryjob-Bypass-Reason: Autoroller
Bugdroid-Send-Email: False
Change-Id: I5da5adfaf6c479bcfb3d5adc52da3c57986a7ddd
Reviewed-on: https://flutter-review.googlesource.com/c/recipes/+/7761
Reviewed-by: flutter-prod-builder@chops-service-accounts.iam.gserviceaccount.com <flutter-prod-builder@chops-service-accounts.iam.gserviceaccount.com>
Commit-Queue: flutter-prod-builder@chops-service-accounts.iam.gserviceaccount.com <flutter-prod-builder@chops-service-accounts.iam.gserviceaccount.com>
diff --git a/infra/config/recipes.cfg b/infra/config/recipes.cfg
index 60e6dbc..1d1031c 100644
--- a/infra/config/recipes.cfg
+++ b/infra/config/recipes.cfg
@@ -25,7 +25,7 @@
   "deps": {
     "build": {
       "branch": "refs/heads/master",
-      "revision": "3cef817d1ee1d9a59a0d13ac77178891ec4e930e",
+      "revision": "4a8addf20958de09e66c3d0eec850580ffb54e1a",
       "url": "https://chromium.googlesource.com/chromium/tools/build"
     },
     "depot_tools": {