Boost stale bot to 100 issues max per run

.github/workflows/stale.yml

@@ -11,6 +11,7 @@ jobs:
     - uses: actions/stale@v1
       with:
         repo-token: ${{ secrets.GITHUB_TOKEN }}
+        operations-per-run: 100
         stale-issue-message: >
           This issue has been automatically marked as stale because it has not
           had recent activity. It will be closed if no further activity occurs.