Bump furo from 2022.6.21 to 2022.12.7 in /docs

Bumps [furo](https://github.com/pradyunsg/furo) from 2022.6.21 to 2022.12.7.
- [Release notes](https://github.com/pradyunsg/furo/releases)
- [Changelog](https://github.com/pradyunsg/furo/blob/main/docs/changelog.md)
- [Commits](pradyunsg/furo@2022.06.21...2022.12.07)

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

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

docs/requirements.txt

@@ -1,4 +1,4 @@
-furo==2022.6.21
+furo==2022.12.7
 sphinx==5.1.1
 sphinx-click==4.3.0
 myst_parser==0.18.0