Pin actions/stale action to 5bef64f

Author: renovate[bot]

.github/workflows/mark-prs-stale.yml

@@ -11,7 +11,7 @@ jobs:
       issues: write
       pull-requests: write
     steps:
-      - uses: actions/stale@v9
+      - uses: actions/stale@5bef64f19d7facfb25b37b414482c7164d639639 # v9
         with:
           stale-pr-message: 'This PR is stale because it has been open 7 days with no activity. If there is no activity in the next 7 days it will be closed automatically'
           stale-pr-label: 'stale'