removed unnecessary type hint

Signed-off-by: Lorenzo Curcio <[email protected]>

Author: Lorenzo Curcio

dapr/actor/runtime/mock_actor.py

@@ -48,7 +48,7 @@ async def set_state(self, data: dict) -> None:
     def __init__(self, actor_id: str, initstate: Optional[dict]):
         self.id = ActorId(actor_id)
         self._runtime_ctx = None  # type: ignore
-        self._state_manager: ActorStateManager = MockStateManager(self, initstate)
+        self._state_manager = MockStateManager(self, initstate)
 
     async def register_timer(
         self,