fix: update web_socket_channel to resolve graphql 5.2.3 compatibility

Updates web_socket_channel from ^2.2.0 to ^3.0.0 in packages that use
graphql ^5.2.3, which requires web_socket_channel ^3.0.1.

This ensures all packages can resolve their dependencies correctly with
the updated graphql version and allows rxdart 0.28.x to be used.

Related to #171

Author: claude

packages/nhost_dart/pubspec.yaml

@@ -36,5 +36,5 @@ dev_dependencies:
   nhost_gql_links: ^4.0.10
   async: ^2.10.0
   stream_channel: ^2.1.1
-  web_socket_channel: ^2.2.0
+  web_socket_channel: ^3.0.0
   uuid: ^4.0.0

packages/nhost_gql_links/pubspec.yaml

@@ -17,7 +17,7 @@ dependencies:
   http: ^1.1.0
   logging: ^1.1.0
   meta: ^1.7.0
-  web_socket_channel: ^2.2.0
+  web_socket_channel: ^3.0.0
 
   #Nhost_dart
   nhost_sdk: ^5.7.0

packages/nhost_graphql_adapter/pubspec.yaml

@@ -23,4 +23,4 @@ dev_dependencies:
   nock: ^1.2.1
   stream_channel: ^2.1.1
   test: ^1.22.0
-  web_socket_channel: ^2.2.0
+  web_socket_channel: ^3.0.0