infra: enable stale action

Author: Tamás Russ

.github/workflows/stale-issues.yml

@@ -17,7 +17,7 @@ jobs:
     steps:
     - uses: actions/stale@v5
       with:
-        debug-only: true # temporary
+        debug-only: false
         repo-token: ${{ secrets.TOKEN_FOR_STALE_ISSUES }}
         days-before-stale: 60
         stale-issue-label: 'stale'