Bump actions/stale from 7 to 8

Bumps [actions/stale](https:/actions/stale) from 7 to 8.
- [Release notes](https:/actions/stale/releases)
- [Changelog](https:/actions/stale/blob/main/CHANGELOG.md)
- [Commits](actions/stale@v7...v8)

---
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

@@ -7,7 +7,7 @@ jobs:
  stale:
  runs-on: ubuntu-latest
  steps:
- - uses: actions/stale@v7
+ - uses: actions/stale@v8
  with:
  stale-issue-message: "This issue was marked as stale due to lack of activity."
  days-before-issue-stale: 60