Bump furo from 2022.2.14.1 to 2022.3.4 in /docs (#2906)

Bumps [furo](https://github.com/pradyunsg/furo) from 2022.2.14.1 to 2022.3.4.
- [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/2022.02.14.1...2022.03.04)

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

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

docs/requirements.txt

@@ -4,4 +4,4 @@ myst-parser==0.16.1
 Sphinx==4.4.0
 sphinxcontrib-programoutput==0.17
 sphinx_copybutton==0.5.0
-furo==2022.2.14.1
+furo==2022.3.4