Bump actions/stale from 8.0.0 to 9.1.0

Bumps [actions/stale](https://github.com/actions/stale) from 8.0.0 to 9.1.0.
- [Release notes](https://github.com/actions/stale/releases)
- [Changelog](https://github.com/actions/stale/blob/main/CHANGELOG.md)
- [Commits](https://github.com/actions/stale/compare/v8.0.0...v9.1.0)

---
updated-dependencies:
- dependency-name: actions/stale
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/stale.yaml

@@ -11,7 +11,7 @@ jobs:
   stale:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/stale@v8.0.0
+      - uses: actions/stale@v9.1.0
         with:
           stale-issue-message: 'This issue has been inactive for 28 days so will be closed 7 days from now. To prevent this, please remove the "stale" label or post a comment.'
           stale-pr-message: 'This PR has been inactive for 28 days so will be closed 7 days from now. To prevent this, please remove the "stale" label or post a comment.'