⬆️ Bump furo from 2022.4.7 to 2022.6.21

Bumps [furo](https://github.com/pradyunsg/furo) from 2022.4.7 to 2022.6.21.
- [Release notes](https://github.com/pradyunsg/furo/releases)
- [Changelog](https://github.com/pradyunsg/furo/blob/main/docs/changelog.md)
- [Commits](pradyunsg/furo@2022.04.07...2022.06.21)

---
updated-dependencies:
- dependency-name: furo
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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