Update dependency async-timeout to v4.0.3

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
async-timeout	==4.0.2 -> ==4.0.3

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Release Notes

aio-libs/async-timeout (async-timeout)

### [`v4.0.3`](https://redirect.github.com/aio-libs/async-timeout/blob/HEAD/CHANGES.rst#403-2023-08-10) [Compare Source](https://redirect.github.com/aio-libs/async-timeout/compare/v4.0.2...v4.0.3) \================== - Fixed compatibility with asyncio.timeout() on Python 3.11+. - Added support for Python 3.11. - Dropped support for Python 3.6.

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