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

recipe_engine:
https://chromium.googlesource.com/infra/luci/recipes-py.git/+/12ab0ef8c9da852fe9d026704f6042545b63a15b
  12ab0ef (tikuta@chromium.org)
      [swarming] add cas support

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

TBR=iannucci@chromium.org

Recipe-Tryjob-Bypass-Reason: Autoroller
Bugdroid-Send-Email: False
Change-Id: I608360932f3e8a67461f2c9f3154dff8593ab74d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/2434801Reviewed-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>