Bump actions/stale from 6 to 9

Bumps [actions/stale](https://github.com/actions/stale) from 6 to 9.
- [Release notes](https://github.com/actions/stale/releases)
- [Changelog](https://github.com/actions/stale/blob/main/CHANGELOG.md)
- [Commits](actions/stale@v6...v9)

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

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

.github/workflows/stale.yml

@@ -9,7 +9,7 @@ jobs:
   stale:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/stale@v6
+    - uses: actions/stale@v9
       with:
         repo-token: ${{ secrets.GITHUB_TOKEN }}
         stale-issue-message: 'The issue labelled as stale because it has been open for more than 7 days with inactivity.'
@@ -19,7 +19,7 @@ jobs:
         exempt-issue-labels: 'Announcement,Pinned'
         remove-stale-when-updated: true
 
-    - uses: actions/stale@v6
+    - uses: actions/stale@v9
       with:
         # Token for the repository. Can be passed in using `{{ secrets.GITHUB_TOKEN }}`.
         repo-token: ${{ secrets.GITHUB_TOKEN }}