fix: properly import requests

[chenghao-mou]

Code to reproduce the issue:

import asyncio

from dotenv import load_dotenv

from google import genai

load_dotenv(".env")

client = genai.Client(
    vertexai=True,
    location="us-central1",
)

model = "gemini-live-2.5-flash-preview-native-audio-09-2025"
config = {"response_modalities": ["TEXT"]}


async def main():
    async with client.aio.live.connect(model=model, config=config) as session:
        message = "Hello, how are you?"
        await session.send_client_content(turns=message, turn_complete=True)


if __name__ == "__main__":
    asyncio.run(main())

It was triggering this issue:

  File "/Users/chenghao/.local/share/uv/python/cpython-3.14.0-macos-aarch64-none/lib/python3.14/contextlib.py", line 214, in __aenter__
    return await anext(self.gen)
           ^^^^^^^^^^^^^^^^^^^^^
  File "/Users/chenghao/Developer/python-genai/google/genai/live.py", line 1024, in connect
    auth_req = google.auth.transport.requests.Request()  # type: ignore
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: module 'google.auth.transport' has no attribute 'requests'. Did you mean: 'Request'?

requests as a module was never imported directly or indirectly.

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