fix: Revert CLIENT_KEEPALIVE back to 60 (#641)

This reverts back to the old default since there is no specific reason to change it.

Author: allenporter

roborock/mqtt/roborock_session.py

@@ -24,7 +24,7 @@
 _LOGGER = logging.getLogger(__name__)
 _MQTT_LOGGER = logging.getLogger(f"{__name__}.aiomqtt")
 
-CLIENT_KEEPALIVE = datetime.timedelta(seconds=120)
+CLIENT_KEEPALIVE = datetime.timedelta(seconds=60)
 TOPIC_KEEPALIVE = datetime.timedelta(seconds=60)
 
 # Exponential backoff parameters