Roll recipe dependencies (trivial).

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

build:
  https://crrev.com/26823485585988f31a621701e613683508c24988 (gbeaty@chromium.org)
    Move validation logic out of chromium's root config item.
depot_tools:
  https://crrev.com/76a2918f55cdd84d70f7df38d6c5a44b744dc75a (vadimsh@chromium.org)
    [lucicfg] Update to 1.14.5.
  https://crrev.com/cf77d6e387b6d0ce269f048e1f858e0ef27be2e5 (vapier@chromium.org)
    repo: update to 2.8 launcher

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

TBR=godofredoc@google.com, keyonghan@google.com, wutong@google.com

Recipe-Tryjob-Bypass-Reason: Autoroller
Bugdroid-Send-Email: False
Change-Id: I9431be69222bc04b22fdc1acfe04bd8914241563
Reviewed-on: https://flutter-review.googlesource.com/c/recipes/+/3260
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>