Fix stale action permissions

Action write permissions is required to update the cache (see actions/stale#1133)

.github/workflows/stale.yml

@@ -8,6 +8,7 @@ jobs:
     runs-on: ubuntu-latest
     permissions:
       issues: write
+      actions: write
     steps:
       - uses: actions/stale@v9
         with:
@@ -22,4 +23,4 @@ jobs:
           only-labels: "pending user feedback"
           exempt-issue-labels: "bug,enhancement,good first issue,backend enhancement,backend issue,backup corruption,bounty,bugreport attached,core logic,docker,filters,help wanted,linux,localization,MacOS,mono,performance issue,reproduced,server side,ssl/tls issue,Synology,tests,translation,UI,windows"
           repo-token: ${{ secrets.GITHUB_TOKEN }}
-          operations-per-run: 60
+          operations-per-run: 500