Bump furo from 2022.2.14.1 to 2022.2.23 in /docs

Bumps [furo](https://github.com/pradyunsg/furo) from 2022.2.14.1 to 2022.2.23.
- [Release notes](https://github.com/pradyunsg/furo/releases)
- [Changelog](https://github.com/pradyunsg/furo/blob/main/docs/changelog.md)
- [Commits](pradyunsg/furo@2022.02.14.1...2022.02.23)

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

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

Author: dependabot[bot]

docs/requirements.txt

@@ -1,3 +1,3 @@
-furo==2022.2.14.1
+furo==2022.2.23
 sphinx==4.4.0
 sphinx-click==3.1.0