Bump sphinx from 5.3.0 to 6.1.2 (#24)

Bumps [sphinx](https://github.com/sphinx-doc/sphinx) from 5.3.0 to 6.1.2.
- [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...v6.1.2)

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

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

Author: dependabot[bot]

poetry.lock

@@ -35,7 +35,7 @@ keywords = [
 [tool.poetry.dependencies]
 python = "^3.8"
 nox = "^2022.8.7"
-sphinx = "^5.3.0"
+sphinx = ">=5.3,<7.0"
 rich = "^12.6.0"
 pytest = "^7.1.3"
 mypy = ">=0.971,<0.992"