Bump actions/stale from 4 to 5.1.0

Bumps [actions/stale](https://github.com/actions/stale) from 4 to 5.1.0.
- [Release notes](https://github.com/actions/stale/releases)
- [Changelog](https://github.com/actions/stale/blob/main/CHANGELOG.md)
- [Commits](actions/stale@v4...v5.1.0)

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

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/stale.yml

@@ -18,7 +18,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Mark stale issues and pull requests
-        uses: actions/stale@v4
+        uses: actions/stale@v5
         with:
           repo-token: ${{ github.token }}
           exempt-issue-labels: "enhancement,question,help wanted,bug"