feat: support Flutter stable channel (#581)

* feat: adjust toggle list block

* chore: upgrade Flutter to master channel

* chore: upgrade pbxproj

* fix: toolbar copy button not closing on mobile editor

* fix: formatting issues and add missing commas

* chore: add stable branch to GitHub Actions workflow

* chore: add missing trailing commas

* chore: adjust indentation padding in block component
configuration and unit tests

test/new/block_component/text_direction_mixin_test.dart

@@ -391,7 +391,7 @@ void main() {
           paragraphNode(
             text: 'س',
             textDirection: blockComponentTextDirectionRTL,
-          )
+          ),
         ],
       );
       final editor = tester.editor..addNode(node);