Bump furo from 2022.9.15 to 2022.9.29 in /docs (#3304)

Bumps [furo](https://github.com/pradyunsg/furo) from 2022.9.15 to 2022.9.29.
- [Release notes](https://github.com/pradyunsg/furo/releases)
- [Changelog](https://github.com/pradyunsg/furo/blob/main/docs/changelog.md)
- [Commits](pradyunsg/furo@2022.09.15...2022.09.29)

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

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Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Cooper Lees <cooper@fb.com>

docs/requirements.txt

@@ -6,4 +6,4 @@ Sphinx==5.2.1
 docutils==0.18.1
 sphinxcontrib-programoutput==0.17
 sphinx_copybutton==0.5.0
-furo==2022.9.15
+furo==2022.9.29