Switch to test repo workflow

Author: dstrome

.github/workflows/StaleBranch.yml

@@ -13,7 +13,7 @@ on:
 jobs:
 
   stale-branch:
-    uses: MicrosoftDocs/microsoft-365-docs/.github/workflows/Shared-StaleBranch.yml@workflows-prod
+    uses: MicrosoftDocs/max-cpub-test/.github/workflows/Shared-StaleBranch.yml@main
     with:
         PayloadJson: ${{ toJSON(github) }}
         RepoBranchSkipList: '[