chore(deps): update actions/stale action to v8 (#209)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/stale.yml

@@ -7,7 +7,7 @@ jobs:
     name: Update stale issues and pull requests
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/stale@v7
+      - uses: actions/stale@v8
         with:
           repo-token: ${{ secrets.GITHUB_TOKEN }}
           stale-issue-message: This issue is stale because it has been open 30 days with no activity. Remove stale label or comment or this will be closed in 5 days.