remove unused imports

tests/test_mqtt.py

@@ -2,7 +2,7 @@ import logging
 import unittest.mock
 
 import pytest
-from paho.mqtt.client import MQTT_ERR_QUEUE_SIZE, MQTT_ERR_SUCCESS, MQTTMessage, Client
+from paho.mqtt.client import MQTTMessage
 
 import intertechno_cc1101_mqtt