Bump sphinx from 2.3.1 to 3.3.1 (#3841)
Bump sphinx from 2.3.1 to 3.3.1 (#3841)

Bumps [sphinx](https://github.com/sphinx-doc/sphinx) from 2.3.1 to 3.3.1.
- [Release notes](https://github.com/sphinx-doc/sphinx/releases)
- [Changelog](https://github.com/sphinx-doc/sphinx/blob/3.x/CHANGES)
- [Commits](https://github.com/sphinx-doc/sphinx/compare/v2.3.1...v3.3.1)

Signed-off-by: dependabot-preview[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>

Co-authored-by: dependabot-preview[bot] <6a4c1c4838f800d1998274cd5234e1f65c55e90c@users.noreply.github.com>
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