Update sphinx requirement from 5.3.0 to 6.1.3 (#162)

Updates the requirements on [sphinx](https://github.com/sphinx-doc/sphinx) to permit the latest version.
- [Release notes](https://github.com/sphinx-doc/sphinx/releases)
- [Changelog](https://github.com/sphinx-doc/sphinx/blob/master/CHANGES)
- [Commits](sphinx-doc/sphinx@v5.3.0...v6.1.3)

---
updated-dependencies:
- dependency-name: sphinx
  dependency-type: direct:development
...

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

pyproject.toml

@@ -49,7 +49,7 @@ dataset = "1.6.0"
 optional = true
 
 [tool.poetry.group.docs.dependencies]
-sphinx="5.3.0"
+sphinx="6.1.3"
 sphinx-autoapi="2.0.1"
 sphinx-copybutton="0.5.1"
 sphinx-rtd-theme="1.2.0"