LabCleaningBot: use logging.debug() for receive_message() errors

main.py

@@ -2,6 +2,7 @@
 
 import time
 import requests
+import logging
 import json
 from result import Result, Ok, Err, is_err
 from typing import List
@@ -218,7 +219,7 @@ class LabCleaningBot:
                     message_result = await self.api.receive_message(websocket)
 
                     if is_err(message_result):
-                        print(message_result.unwrap_err())
+                        logging.debug(message_result.unwrap_err())
                         continue
                     else:
                         message = message_result.unwrap()