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/+/34f43c51585b6113740640659cca0ddd27289684
  34f43c5 (bryner@google.com)
      Fix JSON serialization of PackageDef preserve_mtime/preserve_wr...

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: I4c58ee1065e40a447c428bb5ac2e3a239361e3d4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/2641533Reviewed-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>