chore: remove import

Author: k11kirky

posthog/test/ai/openai/test_openai.py

@@ -1,6 +1,6 @@
 import json
 import time
-from unittest.mock import MagicMock, patch
+from unittest.mock import patch
 
 import pytest
 from openai.types.chat import ChatCompletion, ChatCompletionMessage, ToolCall, ToolCallFunction