chore(deps): update actions/stale digest to a21a081

Author: renovate[bot]

.github/workflows/stale.yml

@@ -10,7 +10,7 @@ jobs:
   stale:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/stale@5bef64f19d7facfb25b37b414482c7164d639639
+      - uses: actions/stale@a21a0816299b11691f9592ef0d63d08e02f06d9d
         with:
           repo-token: ${{ secrets.GITHUB_TOKEN }}
           stale-issue-message: 'This issue has been automatically marked as stale due to inactivity and will be closed in 7 days if no further activity occurs.'