Python 3.8 fixes

mappingservice/utils.py

@@ -21,7 +21,10 @@ def log_memory_usage():
 
 
 def safe_round(value, decimals=0):
-    return round(value, decimals) if isinstance(value, int | float) else 0
+    if isinstance(value, int) or isinstance(value, float):
+        return round(value, decimals)
+    
+    return 0
 
 
 def process_predictions(predictions, score_key="score", label_key="label"):