[*] set explicit permissions for Stale GHA workflow (#1258)

Potential fix for code scanning alert no. 19: Workflow does not contain permissions

Co-authored-by: Copilot Autofix powered by AI <62310815+github-advanced-security[bot]@users.noreply.github.com>

Author: pashagolub

.github/workflows/stale.yml

@@ -10,6 +10,10 @@ on:
 jobs:
   stale:
     if: false # false to skip job during debug
+    permissions:
+      contents: read
+      issues: write
+      pull-requests: write
     runs-on: ubuntu-latest
     steps:
     - uses: actions/stale@v10