Bump actions/stale from 8 to 9

Bumps [actions/stale](https://github.com/actions/stale) from 8 to 9.
- [Release notes](https://github.com/actions/stale/releases)
- [Changelog](https://github.com/actions/stale/blob/main/CHANGELOG.md)
- [Commits](actions/stale@v8...v9)

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

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

.github/workflows/stale.yaml

@@ -8,7 +8,7 @@ jobs:
   stale:
     runs-on: 'ubuntu-latest'
     steps:
-    - uses: 'actions/stale@v8'
+    - uses: 'actions/stale@v9'
       with:
         repo-token: ${{ secrets.GITHUB_TOKEN }}