Bump actions/stale from 7 to 8

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](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]>
Signed-off-by: Nigel Jones <[email protected]>

.github/workflows/stale.yml

@@ -13,7 +13,7 @@ jobs:
     steps:
       - name: check stale issues and prs
         if: startsWith(github.repository,'odpi/')
-        uses: actions/stale@v7
+        uses: actions/stale@v8
         with:
           repo-token: ${{ secrets.GITHUB_TOKEN }}
           stale-issue-message: >