chore: fix lint whitespace

Author: allenporter

roborock/mqtt/roborock_session.py

@@ -144,7 +144,6 @@ async def _run_task(self, start_future: asyncio.Future[None] | None) -> None:
             await asyncio.sleep(self._backoff.total_seconds())
             self._backoff = min(self._backoff * BACKOFF_MULTIPLIER, MAX_BACKOFF_INTERVAL)
 
-
     @asynccontextmanager
     async def _mqtt_client(self, params: MqttParams) -> aiomqtt.Client:
         """Connect to the MQTT broker and listen for messages."""