Bump furo from 2023.7.26 to 2023.8.19 in /docs + sphinx to 7.2.3 (#3848)

* Bump furo from 2023.7.26 to 2023.8.19 in /docs

Bumps [furo](https://github.com/pradyunsg/furo) from 2023.7.26 to 2023.8.19.
- [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/2023.07.26...2023.08.19

)

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

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

* Move to sphinx 7.2.3 + fix intersphinx_mapping

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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 Ry Lees <me@cooperlees.com>