use latest repo-sync/github-sync (#15798)

* use latest repo-sync/github-sync

* Update repo-sync.yml

.github/workflows/repo-sync.yml

@@ -24,11 +24,11 @@ jobs:
       uses: actions/checkout@v2
 
     - name: Sync repo to branch
-      uses: repo-sync/github-sync@v2.1.0
+      uses: repo-sync/github-sync@v2
       env:
         GITHUB_TOKEN: ${{ secrets.OCTOMERGER_PAT_WITH_REPO_AND_WORKFLOW_SCOPE }}
       with:
-        source_repo: ${{ secrets.SOURCE_REPO }}
+        source_repo: ${{ secrets.SOURCE_REPO }} # https://${access_token}@github.com/github/the-other-repo.git
         source_branch: main
         destination_branch: repo-sync
         github_token: ${{ secrets.OCTOMERGER_PAT_WITH_REPO_AND_WORKFLOW_SCOPE }}