Use correct form of logging

Signed-off-by: Mathias L. Baumann <[email protected]>

Author: Marenz

src/frequenz/client/dispatch/test/_service.py

@@ -46,6 +46,8 @@
 NONE_KEY = "none"
 """Key that has no access to any resources in the FakeService."""
 
+_logger = logging.getLogger(__name__)
+
 
 class FakeService:
     """Dispatch mock service for testing."""
@@ -178,7 +180,7 @@ async def StreamMicrogridDispatches(
         receiver = self._stream_channel.new_receiver()
 
         async for message in receiver:
-            logging.debug("Received message: %s", message)
+            _logger.debug("Received message: %s", message)
             if message.microgrid_id == MicrogridId(request.microgrid_id):
                 response = StreamMicrogridDispatchesResponse(
                     event=message.event.event.value,