chore(examples): update realtime model

closes #2020

README.md

@@ -275,7 +275,7 @@ from openai import AsyncOpenAI
 async def main():
  client = AsyncOpenAI()
 
- async with client.beta.realtime.connect(model="gpt-4o-realtime-preview-2024-10-01") as connection:
+ async with client.beta.realtime.connect(model="gpt-4o-realtime-preview") as connection:
  await connection.session.update(session={'modalities': ['text']})
 
  await connection.conversation.item.create(
@@ -309,7 +309,7 @@ Whenever an error occurs, the Realtime API will send an [`error` event](https://
 ```py
 client = AsyncOpenAI()
 
-async with client.beta.realtime.connect(model="gpt-4o-realtime-preview-2024-10-01") as connection:
+async with client.beta.realtime.connect(model="gpt-4o-realtime-preview") as connection:
  ...
  async for event in connection:
  if event.type == 'error':

examples/realtime/push_to_talk_app.py

@@ -152,7 +152,7 @@ async def on_mount(self) -> None:
  self.run_worker(self.send_mic_audio())
 
  async def handle_realtime_connection(self) -> None:
- async with self.client.beta.realtime.connect(model="gpt-4o-realtime-preview-2024-10-01") as conn:
+ async with self.client.beta.realtime.connect(model="gpt-4o-realtime-preview") as conn:
  self.connection = conn
  self.connected.set()