chore(deps): update dependency sphinx-autodoc-typehints to v2

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
sphinx-autodoc-typehints (changelog)	1.25.3 -> 2.0.0

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Release Notes

tox-dev/sphinx-autodoc-typehints (sphinx-autodoc-typehints)

### [`v2.0.0`](https://togithub.com/tox-dev/sphinx-autodoc-typehints/releases/tag/2.0.0) [Compare Source](https://togithub.com/tox-dev/sphinx-autodoc-typehints/compare/1.25.3...2.0.0) #### What's Changed - Add option to force unions (and options) to be rendered with bars by [@​hoodmane](https://togithub.com/hoodmane) in [https://github.com/tox-dev/sphinx-autodoc-typehints/pull/418](https://togithub.com/tox-dev/sphinx-autodoc-typehints/pull/418) (on by default, hence major version bump) **Full Changelog**: https://github.com/tox-dev/sphinx-autodoc-typehints/compare/1.25.3...2.0.0

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