Bump furo from 2021.9.8 to 2021.9.22
Bump furo from 2021.9.8 to 2021.9.22

Bumps [furo](https://github.com/pradyunsg/furo) from 2021.9.8 to 2021.9.22.
- [Release notes](https://github.com/pradyunsg/furo/releases)
- [Changelog](https://github.com/pradyunsg/furo/blob/main/docs/changelog.md)
- [Commits](https://github.com/pradyunsg/furo/compare/2021.09.08...2021.09.22)

---
updated-dependencies:
- dependency-name: furo
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>
ICTU/quality-time,ICTU/quality-time,ICTU/quality-time,ICTU/quality-time