Bump sphinx from 4.0.1 to 4.0.2

Bumps [sphinx](https://github.com/sphinx-doc/sphinx) from 4.0.1 to 4.0.2.
- [Release notes](https://github.com/sphinx-doc/sphinx/releases)
- [Changelog](https://github.com/sphinx-doc/sphinx/blob/4.x/CHANGES)
- [Commits](https://github.com/sphinx-doc/sphinx/compare/v4.0.1...v4.0.2

)

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