chore: Adding missing permissions to stale workflow (#1265)

Author: devin-ai-integration[bot]

.github/workflows/stale.yml

@@ -3,6 +3,11 @@ on:
   schedule:
     - cron: '30 1 * * *'
 
+
+permissions:
+  issues: write
+  pull-requests: write
+
 jobs:
   stale:
     runs-on: ubuntu-latest