fix: also close all pubsub clients

Author: benedikt-bartscher

reflex/state.py

@@ -3641,6 +3641,10 @@ async def close(self):
         redis = await self.get_redis()
         await redis.close()
 
+        for pubsub in self._pubsub_clients.values():
+            await pubsub.close()
+        self._pubsub_clients = {}
+
 
 def get_state_manager() -> StateManager:
     """Get the state manager for the app that is currently running.