Bump actions/stale from 8.0.0 to 9.0.0 (#121)

Bumps [actions/stale](https://github.com/actions/stale) from 8.0.0 to 9.0.0.
- [Release notes](https://github.com/actions/stale/releases)
- [Changelog](https://github.com/actions/stale/blob/main/CHANGELOG.md)
- [Commits](actions/stale@v8.0.0...v9.0.0)

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

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/stale.yml

@@ -30,7 +30,7 @@ jobs:
   stale:
     runs-on: ubuntu-22.04
     steps:
-      - uses: actions/stale@v8.0.0
+      - uses: actions/stale@v9.0.0
         with:
           stale-issue-label: 'stale'
           exempt-issue-labels: 'not-stale'