Run the stall check every 2 hours (#16864)

Co-authored-by: Chiedo <chiedo@users.noreply.github.com>

.github/workflows/repo-sync-stalls.yml

@@ -2,7 +2,7 @@ name: Repo Sync Stalls
 on:
   workflow_dispatch:
   schedule:
-    - cron: '*/30 * * * *'
+    - cron: '0 */2 * * *'
 jobs:
   check-freezer:
     name: Check for deployment freezes