Remove 'asyncio' from pip install command (Build a coding agent with GPT 5.1)

[yishangupenn]

Copied from upstream: openai/openai-cookbook#2266
Original author: @ftnext
Originally opened: 2025-12-01

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Summary

No need to install asyncio from PyPI

Motivation

asyncio is included in stdlib and PyPi's asyncio is obsolete backport
https://pypi.org/project/asyncio/

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