Remove a redundant async method

Author: SmileyChris

graphql_ws/base_async.py

@@ -121,9 +121,6 @@ def process_message(self, connection_context, parsed_message):
         connection_context.remember_task(task)
         return task
 
-    async def send_message(self, *args, **kwargs):
-        await super().send_message(*args, **kwargs)
-
     async def on_open(self, connection_context):
         pass