minor fix: Object of type int64 is not JSON serializable (#23109)

api/services/annotation_service.py

@@ -280,7 +280,7 @@ class AppAnnotationService:
 
         try:
             # Skip the first row
-            df = pd.read_csv(file)
+            df = pd.read_csv(file, dtype=str)
             result = []
             for index, row in df.iterrows():
                 content = {"question": row.iloc[0], "answer": row.iloc[1]}