Bump actions/stale from 4 to 8

Bumps [actions/stale](https://github.com/actions/stale) from 4 to 8.
- [Release notes](https://github.com/actions/stale/releases)
- [Changelog](https://github.com/actions/stale/blob/main/CHANGELOG.md)
- [Commits](actions/stale@v4...v8)

---
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

@@ -10,7 +10,7 @@ jobs:
       issues: write
       pull-requests: write
     steps:
-      - uses: actions/stale@v4
+      - uses: actions/stale@v8
         with:
           stale-issue-message: This issue is now marked as stale because it hasn't seen activity for a while. Add a comment or it will be closed soon.
           stale-pr-message: This PR is now marked as stale because it hasn't seen activity for a while. Add a comment or it will be closed soon.