Bump furo from 2024.1.29 to 2024.5.6

Bumps [furo](https://github.com/pradyunsg/furo) from 2024.1.29 to 2024.5.6.
- [Release notes](https://github.com/pradyunsg/furo/releases)
- [Changelog](https://github.com/pradyunsg/furo/blob/main/docs/changelog.md)
- [Commits](pradyunsg/furo@2024.01.29...2024.05.06)

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

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

dev-requirements.txt

@@ -24,7 +24,7 @@ wheel
 Sphinx>=4.3.0,<7.4.0
 
 # Sphinx theme: https://sphinx-themes.org/sample-sites/furo/
-furo==2024.1.29
+furo==2024.5.6
 
 # Lets Sphinx parse markdown files in addition to rst.
 myst-parser>=0.15.2,<3.1.0