add patch for flutter-quill to fix the checkbox customize issue

frontend/app_flowy/pubspec.yaml

@@ -42,7 +42,7 @@ dependencies:
   flutter_quill:
     git:
       url: https://github.com/appflowy/flutter-quill.git
-      tag: 3.0.4
+      tag: 3.0.4_checkbox_patch
   
   #  third party packages
   intl: ^0.17.0