fix: update auto-close-duplicates workflow permissions to write

Change issues permission from read to write to fix 403 Forbidden
errors when attempting to close duplicate issues.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

.github/workflows/auto-close-duplicates.yml

@@ -11,7 +11,7 @@ jobs:
     timeout-minutes: 10
     permissions:
       contents: read
-      issues: read
+      issues: write
 
     steps:
       - name: Checkout repository