fix - arena call

src/leaderboards/get_from_hub.py

@@ -15,7 +15,7 @@ def group_all_tags(input_tags: list[str]) -> dict:
     output_tags = defaultdict(list)
     for tag in input_tags:
         if tag == "arena":
-            output_tags.append("judge:humans")
+            output_tags["judge"].append("humans")
             continue
 
         try: