Update actions/stale action to v9.1.0 (#52)

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

Author: renovate[bot]

actions/clean-up-repo/action.yml

@@ -32,7 +32,7 @@ runs:
   steps:
     - name: Clean issues and PRs
       id: stale_issues_prs
-      uses: actions/stale@v9.0.0
+      uses: actions/stale@v9.1.0
       with:
         repo-token: ${{ inputs.token }}
         stale-issue-message: 'This issue is stale because it has been open ${{ inputs.days-before-pr-stale }} days with no activity. Remove stale label or comment or this will be closed in ${{ inputs.days-before-pr-delete }} days'