Roll recipe dependencies (trivial).

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

The build that created this CL was
https://ci.chromium.org/b/8754827705870773761

depot_tools:
https://chromium.googlesource.com/chromium/tools/depot_tools.git/+log/00915b68748cc78969f6269b78ddaae0a120e993~..6b84fbfb201f8fd99c3d049328615943a7df3593
  00915b6 (gavinmak@google.com)
      Implement _ProvidedDiffCache.GetOldContents
  6b84fbf (msavigny@google.com)
      Remove ability to use_goma in autoninja (chromeos excepted)

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: I1e86e41f2dcd236b2524abc0f98983eb661308ff
Reviewed-on: https://flutter-review.googlesource.com/c/recipes/+/55622
Commit-Queue: flutter-prod-builder@chops-service-accounts.iam.gserviceaccount.com <flutter-prod-builder@chops-service-accounts.iam.gserviceaccount.com>
Bot-Commit: 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 4907c01..b676e35 100644
--- a/infra/config/recipes.cfg
+++ b/infra/config/recipes.cfg
@@ -22,12 +22,12 @@
   "deps": {
     "dart": {
       "branch": "refs/heads/main",
-      "revision": "2632b98a057f3cdfa4054dc01f273927f0fd1e2b",
+      "revision": "279c6eb33ceeadf2dbcf4a13a47c0a0048d4d4d3",
       "url": "https://dart.googlesource.com/recipes.git"
     },
     "depot_tools": {
       "branch": "refs/heads/main",
-      "revision": "af26c1dfaae2f3c632d88bf9bd78526866afe180",
+      "revision": "6b84fbfb201f8fd99c3d049328615943a7df3593",
       "url": "https://chromium.googlesource.com/chromium/tools/depot_tools.git"
     },
     "fuchsia": {