Updated the openai.py

Author: Ethan-han921

openevolve/llm/openai.py

@@ -1,8 +1,15 @@
 """
 OpenAI API interface for LLMs
 """
-
 import asyncio
+
+try:
+    asyncio.get_running_loop()
+except RuntimeError:
+
+    loop = asyncio.new_event_loop()
+    asyncio.set_event_loop(loop)
+
 import logging
 import time
 from typing import Any, Dict, List, Optional, Union