fix: test case on windows

tests/unit_tests/dataframe/test_loader.py

@@ -1,9 +1,9 @@
+import sys
 from datetime import datetime, timedelta
 from unittest.mock import mock_open, patch
 
 import pandas as pd
 import pytest
-import sys
 
 from pandasai.data_loader.loader import DatasetLoader
 from pandasai.dataframe.base import DataFrame