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/+/dbdb4601a494804eaf83d06b6bb18c94e5f776c9
  dbdb460 (gbeaty@chromium.org)
      Update the version of attrs used in recipe engine.

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

R=iannucci@chromium.org

Recipe-Tryjob-Bypass-Reason: Autoroller
Bugdroid-Send-Email: False
Change-Id: I5f580b2ef32f53a2cda447c02d48a3b7ae48db62
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/2729401
Commit-Queue: Recipe Roller <recipe-mega-autoroller@chops-service-accounts.iam.gserviceaccount.com>
Bot-Commit: Recipe Roller <recipe-mega-autoroller@chops-service-accounts.iam.gserviceaccount.com>