Update freezegun to 1.4.0

[pyup-bot]

This PR updates freezegun from 1.2.2 to 1.4.0.

Changelog

1.4.0

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* `asyncio`-support from 1.3.x introduced quite a few  bugs, so that functionality is now hidden behind a flag:
`with freeze_time('1970-01-02', real_asyncio=True):`

1.3.1

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* Fixed the release number in the build

1.3.0

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* Fixed `asyncio` support to avoid `await asyncio.sleep(1)` hanging forever.

* Added support for Python 3.12

Links

• PyPI: https://pypi.org/project/freezegun
• Changelog: https://data.safetycli.com/changelogs/freezegun/
• Repo: https://github.com/spulec/freezegun

[pyup-bot]

Closing this in favor of #647