Bump furo from 2021.11.16 to 2021.11.23 in /requirements

Bumps [furo](https://github.com/pradyunsg/furo) from 2021.11.16 to 2021.11.23.
- [Release notes](https://github.com/pradyunsg/furo/releases)
- [Changelog](https://github.com/pradyunsg/furo/blob/main/docs/changelog.md)
- [Commits](pradyunsg/furo@2021.11.16...2021.11.23)

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

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

Author: dependabot[bot]

requirements/dev-requirements.txt

@@ -12,7 +12,7 @@ flake8-commas==2.1.0  # Require silicon valley commas
 flake8-quotes==3.3.1  # Require single quotes
 flake8==4.0.1  # Lint
 freezegun==1.1.0  # Freeze time in tests
-furo==2021.11.16
+furo==2021.11.23
 isort==5.10.1  # Lint imports
 keyring==23.2.1
 mypy==0.910 # Type checking