fix for failing flutter test

Author: lohanidamodar

templates/flutter/pubspec.yaml.twig

@@ -25,7 +25,7 @@ dependencies:
   package_info_plus: ^4.0.2
   path_provider: ^2.0.15
   web_socket_channel: ^2.4.0
-  universal_html: ^2.2.3
+  universal_html: ^2.2.2
 
 dev_dependencies:
   path_provider_platform_interface: ^2.0.6