S2S context summarization: Upgrade websockets.connect() call to v15 - #36

Cell In[12], line 20, in realtime_session(model, voice, enable_playback)
     17 url = f"wss://api.openai.com/v1/realtime?model={model}"
     18 headers = {"Authorization": f"Bearer {openai.api_key}"}
---> 20 async with websockets.connect(url, extra_headers=headers, max_size=1 << 24) as ws:

TypeError: BaseEventLoop.create_connection() got an unexpected keyword argument 'extra_headers'