Fixed error where an int was attempted to be concatenated in a LOG, producing an exception

src/l3_centralizedattackdetector/service/l3_centralizedattackdetectorServiceServicerImpl.py

@@ -100,7 +100,7 @@ class l3_centralizedattackdetectorServiceServicerImpl(L3Centralizedattackdetecto
         self.cryptomining_detector_features_metadata.sort()
         LOGGER.info("Cryptomining Detector Features: " + str(self.cryptomining_detector_features_metadata))
         
-        LOGGER.info("Batch size: " + BATCH_SIZE)
+        LOGGER.info("Batch size: " + str(BATCH_SIZE))
 
         self.input_name = self.cryptomining_detector_model.get_inputs()[0].name
         self.label_name = self.cryptomining_detector_model.get_outputs()[0].name