Bump actions/stale from 7 to 9

Bumps [actions/stale](https://github.com/actions/stale) from 7 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/v7...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

@@ -18,7 +18,7 @@ jobs:
   stale:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/stale@v7
+      - uses: actions/stale@v9
         with:
           ascending: true # Spend API operations budget on older, more-likely-to-get-closed issues first
           close-issue-message: "" # Leave no comment when closing