github-actions(deps): bump actions/stale from 5 to 6

Bumps [actions/stale](https://github.com/actions/stale) from 5 to 6.
- [Release notes](https://github.com/actions/stale/releases)
- [Changelog](https://github.com/actions/stale/blob/main/CHANGELOG.md)
- [Commits](actions/stale@v5...v6)

---
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/prune.yaml

@@ -18,7 +18,7 @@ jobs:
 
     steps:
       - name: "Prune issues and pull requests"
-        uses: "actions/stale@v5"
+        uses: "actions/stale@v6"
         with:
           days-before-close: "${{ env.DAYS_BEFORE_CLOSE }}"
           days-before-stale: "${{ env.DAYS_BEFORE_STALE }}"