ci: add/update workflow for autosquash on PRs

Author: wetransformer

.github/workflows/tf-autosquash.yml

@@ -30,7 +30,7 @@ jobs:
           private-key: ${{ secrets.WE_HELPER_GITHUB_PRIVATE_KEY }}
 
       - name: Checkout the repository and persist credentials
-        uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
+        uses: actions/checkout@1af3b93b6815bc44a9784bd300feb67ff0d1eeb3 # v6.0.0
         with:
           token: ${{ steps.app-token.outputs.token || github.token }}
           fetch-depth: 0 # otherwise rebase will fail if PR is not based on the latest commit