Bug 1795042 - [ci] Migrate 'repo-update' tasks from AWS -> GCP, r=MasterWayZ

Depends on D163332

Differential Revision: https://phabricator.services.mozilla.com/D163334

taskcluster/ci/repo-update/kind.yml

@@ -44,7 +44,7 @@ jobs:
             platform: linux64/opt
             symbol: pfu
             tier: 1
-        worker-type: b-linux
+        worker-type: b-linux-gcp
         worker:
             implementation: docker-worker
             os: linux