feat(graphql_flutter): bump connectivity_plus dependency to ^4.0.0

Author: ndelanou

packages/graphql_flutter/pubspec.yaml

@@ -15,7 +15,7 @@ dependencies:
   meta: ^1.7.0
   path_provider: ^2.0.1
   path: ^1.8.0
-  connectivity_plus: ^3.0.0
+  connectivity_plus: ^4.0.0
   hive: ^2.0.0
   plugin_platform_interface: ^2.0.0
   flutter_hooks: ^0.18.2