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](https://github.com/actions/stale/compare/v8...v9)

---
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.yml

@@ -16,7 +16,7 @@ jobs:
           app_id: ${{ secrets.APP_ID }}
           private_key: ${{ secrets.PRIVATE_KEY }}
     
-      - uses: actions/stale@v8
+      - uses: actions/stale@v9
         with:
           stale-issue-message: "This issue is stale because it has been open 10 days with no activity. Remove stale label or comment or this will be closed in 7 days."
           stale-pr-message: "This PR is stale because it has been open 3 days with no activity. Remove stale label or comment or this will be closed in 11 days."