Roll recipe dependencies (trivial).

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

The build that created this CL was
https://ci.chromium.org/b/8746782915509046833

dart:
https://dart.googlesource.com/recipes.git/+/8d7a1c96baf8aa380994d86b953db464f02cccd5
  8d7a1c9 (athom@google.com)
      [dartdoc] Upload files to new bucket as well

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@grotations.appspotmail.com

Recipe-Tryjob-Bypass-Reason: Autoroller
Ignore-Freeze: Autoroller
Bugdroid-Send-Email: False
Change-Id: I2c731be974e1045392b969d2a4e31a564c39660a
Reviewed-on: https://flutter-review.googlesource.com/c/recipes/+/57740
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>
diff --git a/infra/config/recipes.cfg b/infra/config/recipes.cfg
index b8bbcea..bda2c61 100644
--- a/infra/config/recipes.cfg
+++ b/infra/config/recipes.cfg
@@ -21,7 +21,7 @@
   "deps": {
     "dart": {
       "branch": "refs/heads/main",
-      "revision": "c00fd26f14982d63a36a34d748971d8030738d95",
+      "revision": "8d7a1c96baf8aa380994d86b953db464f02cccd5",
       "url": "https://dart.googlesource.com/recipes.git"
     },
     "depot_tools": {