do not init clock at class level

Author: maximpertsov

src/viam/sessions_client.py

@@ -48,14 +48,14 @@ class SessionsClient:
 
     _current_id: str = ""
     _disabled: bool = False
-    _lock = asyncio.Lock(**loop_kwargs())
     _supported: Optional[bool] = None
     _heartbeat_interval: Optional[timedelta] = None
 
     def __init__(self, channel: Channel, *, disabled: bool = False):
         self.channel = channel
         self.client = RobotServiceStub(channel)
         self._disabled = disabled
+        self._lock = asyncio.Lock(**loop_kwargs())
 
         listen(self.channel, SendRequest, self._send_request)
         listen(self.channel, RecvTrailingMetadata, self._recv_trailers)