Roll recipe dependencies (trivial).

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

The build that created this CL was
https://ci.chromium.org/b/8789175327524054001

fuchsia:
https://fuchsia.googlesource.com/infra/recipes.git/+/a21fb86810e39979932630e32b984b4de6e2b6e6
  a21fb86 (olivernewman@google.com)
      [3p_prebuilts] Convert to proto properties

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: I9e1ff87201390164cc164e0a10507ace3a855356
Reviewed-on: https://flutter-review.googlesource.com/c/recipes/+/39205
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 edc3ae7..d3d92f7 100644
--- a/infra/config/recipes.cfg
+++ b/infra/config/recipes.cfg
@@ -28,7 +28,7 @@
     },
     "fuchsia": {
       "branch": "refs/heads/main",
-      "revision": "db2e46a7d2b8ff44c0a29c46ac4aa5acaef708ed",
+      "revision": "a21fb86810e39979932630e32b984b4de6e2b6e6",
       "url": "https://fuchsia.googlesource.com/infra/recipes.git"
     },
     "recipe_engine": {