⬆️ Update dependency async-timeout to v5

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
async-timeout	4.0.3 -> 5.0.1

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Release Notes

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

v5.0.1

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Misc

• #&#8203;423 <https://github.com/aio-libs/async-timeout/issues/423>_

v5.0.0

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Features

• Make asyncio_timeout fully compatible with the standard asyncio.Timeout but keep backward compatibility with existing asyncio_timeout.Timeout API. (#&#8203;422 <https://github.com/aio-libs/async-timeout/issues/422>_)

Improved Documentation

• On the CHANGES/README.rst <https://github.com/aio-libs/async-timeout/tree/master/CHANGES/README.rst>_ page,
  a link to the Towncrier philosophy has been fixed. (#&#8203;388 <https://github.com/aio-libs/async-timeout/issues/388>_)

Deprecations and Removals

• Drop deprecated sync context manager support, use async with timeout(...): ... instead. (#&#8203;421 <https://github.com/aio-libs/async-timeout/issues/421>_)

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