Roll recipe dependencies (trivial).

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

The build that created this CL was
https://ci.chromium.org/b/8674437463984879265

dart:
https://dart.googlesource.com/recipes.git/+/e1bf60498b5fdd15a0260ed3562c312a8523c4b2
  e1bf604 (rmacnak@google.com)
      Fix Dart executable path for shards.

depot_tools:
https://chromium.googlesource.com/chromium/tools/depot_tools.git/+log/6688f8fd9e58ddf983b7d9ac65e5483afbf3fdc2~..956e4cf627620e03a03ecafe1daf3d0e5fae102b
  6688f8f (ovsienko@google.com)
      vpython: update vpython version.
  956e4cf (ovsienko@google.com)
      ruff: remove wrong .bat from vpython call.

fuchsia:
https://fuchsia.googlesource.com/infra/recipes.git/+/e74561613fa81525b5e03036c02d7f739b03c99b
  e745616 (global-integration-roller@fuchsia-infra.iam.gserviceaccount.com)
      [roll] Update coverage pinned tools

Please check the following references for more information:
- autoroller, https://chromium.googlesource.com/infra/luci/recipes-py/+/main/doc/workflow.md#autoroller
- rollback, https://chromium.googlesource.com/infra/luci/recipes-py/+/main/doc/workflow.md#rollback
- cross-repo dependencies, https://chromium.googlesource.com/infra/luci/recipes-py/+/main/doc/cross_repo.md

Use https://goo.gl/noib3a to file a bug.

R=flutter-infra-notify+luci-recipes@google.com

Recipe-Tryjob-Bypass-Reason: Autoroller
Ignore-Freeze: Autoroller
Bugdroid-Send-Email: False
Change-Id: I1a8679db552882d95383cc8b50a468f0dffb7965
Reviewed-on: https://flutter-review.googlesource.com/c/recipes/+/81100
Bot-Commit: 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>