upgrade connectivity_plus & Resolve error log

1. Upgrate: connectivity_plus: ^6.0.3 for graphql_flutter package.
2. Resolve: error log is throwed from graphql package althought it doesn't make any crash.

Author: Klever

packages/graphql/lib/src/links/websocket_link/websocket_client.dart

@@ -215,7 +215,8 @@ class SocketClient {
   final SocketClientConfig config;
 
   final BehaviorSubject<SocketConnectionState> _connectionStateController =
-      BehaviorSubject<SocketConnectionState>();
+      BehaviorSubject<SocketConnectionState>.seeded(
+          SocketConnectionState.notConnected);
 
   final HashMap<String, SubscriptionListener> _subscriptionInitializers =
       HashMap();

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: ^6.0.1
+  connectivity_plus: ^6.0.3
   hive: ^2.0.0
   plugin_platform_interface: ^2.0.0
   flutter_hooks: '>=0.18.2 <0.21.0'