fix: remove unused import of MagicMock in test_influxdb_client_3.py

Author: bednar

tests/test_influxdb_client_3.py

@@ -1,6 +1,6 @@
 import re
 import unittest
-from unittest.mock import patch, MagicMock
+from unittest.mock import patch
 
 from pytest_httpserver import HTTPServer