fix: update used-by.yml to add permissions

Author: shenxianpeng

.github/workflows/used-by.yml

@@ -6,6 +6,10 @@ on:
     - cron: '0 9 * * 1' # At 09:00 on Monday.
   workflow_dispatch:
 
+permissions:
+  pull-requests: write
+  contents: write
+
 jobs:
   used-by:
     runs-on: ubuntu-latest