Bumps [mypy](https://github.com/python/mypy) from 0.910 to 0.920.
- [Release notes](https://github.com/python/mypy/releases)
- [Commits](python/mypy@v0.910...v0.920)

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Bumps [sphinx](https://github.com/sphinx-doc/sphinx) from 4.3.1 to 4.3.2.
- [Release notes](https://github.com/sphinx-doc/sphinx/releases)
- [Changelog](https://github.com/sphinx-doc/sphinx/blob/4.x/CHANGES)
- [Commits](sphinx-doc/sphinx@v4.3.1...v4.3.2)

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Bumps [types-requests](https://github.com/python/typeshed) from 2.26.1 to 2.26.2.
- [Release notes](https://github.com/python/typeshed/releases)
- [Commits](https://github.com/python/typeshed/commits)

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Bumps [mypy](https://github.com/python/mypy) from 0.920 to 0.930.
- [Release notes](https://github.com/python/mypy/releases)
- [Commits](python/mypy@v0.920...v0.930)

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Bumps [requests](https://github.com/psf/requests) from 2.26.0 to 2.27.1.
- [Release notes](https://github.com/psf/requests/releases)
- [Changelog](https://github.com/psf/requests/blob/main/HISTORY.md)
- [Commits](psf/requests@v2.26.0...v2.27.1)

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Bumps [types-requests](https://github.com/python/typeshed) from 2.26.2 to 2.26.3.
- [Release notes](https://github.com/python/typeshed/releases)
- [Commits](https://github.com/python/typeshed/commits)

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Bumps [types-requests](https://github.com/python/typeshed) from 2.26.3 to 2.27.0.
- [Release notes](https://github.com/python/typeshed/releases)
- [Commits](https://github.com/python/typeshed/commits)

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Bumps [types-requests](https://github.com/python/typeshed) from 2.27.0 to 2.27.5.
- [Release notes](https://github.com/python/typeshed/releases)
- [Commits](https://github.com/python/typeshed/commits)

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Bumps [mypy](https://github.com/python/mypy) from 0.930 to 0.931.
- [Release notes](https://github.com/python/mypy/releases)
- [Commits](python/mypy@v0.930...v0.931)

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Bumps [types-requests](https://github.com/python/typeshed) from 2.27.5 to 2.27.6.
- [Release notes](https://github.com/python/typeshed/releases)
- [Commits](https://github.com/python/typeshed/commits)

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Update flake8 to >4.0.0 as poetry installed an old version which was
incompatible with recent pythons.

…ERS (#94)

* Fix mypy error when trying to update HeaderValueMatcher.DEFAULT_MATCHERS

* Use MutableMapping to annotate HeaderValueMatcher.DEFAULT_MATCHERS