Bump actions/stale from 7 to 8 (#133)

Bumps [actions/stale](https://github.com/actions/stale) from 7 to 8.
- [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...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>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/stale.yaml

@@ -20,7 +20,7 @@ jobs:
       pull-requests: write
     steps:
 
-    - uses: actions/stale@v7
+    - uses: actions/stale@v8
       with:
         stale-issue-message: >
           This issue has been automatically marked as stale because it has not had