Revert "Core: update websockets (#4732)" (#4753)

This reverts commit 42eaeb92f0.

CommonClient.py

@@ -417,7 +417,7 @@ class CommonContext:
 
     async def send_msgs(self, msgs: typing.List[typing.Any]) -> None:
         """ `msgs` JSON serializable """
-        if not self.server or self.server.socket.state != websockets.protocol.State.OPEN:
+        if not self.server or not self.server.socket.open or self.server.socket.closed:
             return
         await self.server.socket.send(encode(msgs))