Update async_timeout to 4.0.3

[pyup-bot]

This PR updates async_timeout from 3.0.1 to 4.0.3.

Changelog

4.0.3

==================

* Fixed compatibility with asyncio.timeout() on Python 3.11+.
* Added support for Python 3.11.
* Dropped support for Python 3.6.

4.0.2

==================

Misc
----

- `259 <https://github.com/aio-libs/async-timeout/issues/259>`_, `#274 <https://github.com/aio-libs/async-timeout/issues/274>`_

4.0.1

==================

- Fix regression:

1. Don't raise TimeoutError from timeout object that doesn't enter into async context
  manager

2. Use call_soon() for raising TimeoutError if deadline is reached on entering into
  async context manager

(258)

- Make ``Timeout`` class available in ``__all__``.

4.0.0

==================

* Implemented ``timeout_at(deadline)`` (117)

* Supported ``timeout.deadline`` and ``timeout.expired`` properties.

* Dropped ``timeout.remaining`` property: it can be calculated as
``timeout.deadline - loop.time()``

* Dropped ``timeout.timeout`` property that returns a relative timeout based on the
timeout object creation time; the absolute ``timeout.deadline`` should be used
instead.

* Added the deadline modification methods: ``timeout.reject()``,
``timeout.shift(delay)``, ``timeout.update(deadline)``.

* Deprecated synchronous context manager usage

Links

• PyPI: https://pypi.org/project/async-timeout
• Changelog: https://pyup.io/changelogs/async-timeout/
• Repo: https://github.com/aio-libs/async-timeout