feat: update GitHub Actions workflow to add permissions for contents and pull requests

Author: shima004

.github/workflows/document.yaml

@@ -19,6 +19,10 @@ concurrency:
   group: 'pages'
   cancel-in-progress: true
 
+permissions:
+  contents: write
+  pull-requests: write
+
 jobs:
   deploy:
     runs-on: ubuntu-latest