Bump furo from 2022.6.21 to 2023.7.26 in /docs

Bumps [furo](https://github.com/pradyunsg/furo) from 2022.6.21 to 2023.7.26.
- [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...2023.07.26)

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

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

docs/requirements.txt

@@ -1,4 +1,4 @@
 sphinx==5.0.2
 sphinx-click==4.2.0
 sphinxcontrib_bibtex==2.4.2
-furo==2022.6.21
+furo==2023.7.26