Fix import order in test_client_dataframe.py (isort)

Author: Saurabh Badenkal

tests/unit/test_client_dataframe.py

@@ -4,8 +4,8 @@
 import unittest
 from unittest.mock import MagicMock
 
-from azure.core.credentials import TokenCredential
 import pandas as pd
+from azure.core.credentials import TokenCredential
 
 from PowerPlatform.Dataverse.client import DataverseClient