Bump sphinx from 3.1.0 to 3.1.1

Bumps [sphinx](https://github.com/sphinx-doc/sphinx) from 3.1.0 to 3.1.1.
- [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/v3.1.0...v3.1.1)

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