use full sha

Author: dasormeter

.github/workflows/auto-update.yml

@@ -13,7 +13,7 @@ jobs:
     name: Auto-update
     runs-on: ubuntu-latest
     steps:
-      - uses: tibdex/auto-update@v2
+      - uses: tibdex/auto-update@4081c5bdc34560b58288a010318054e63e6f4a51
         with:
           github_token: ${{ secrets.AUTO_REBASE_PAT }}