chore: Remove unused import of 'cast'

realtime/connection.py

@@ -3,7 +3,7 @@
 import logging
 from collections import defaultdict
 from functools import wraps
-from typing import Any, Callable, List, Dict, cast, TypeVar, DefaultDict
+from typing import Any, Callable, List, Dict, TypeVar, DefaultDict
 
 import websockets
 from typing_extensions import ParamSpec