chore: bump sphinx from 4.1.2 to 4.2.0 (#17)

Bumps [sphinx](https://github.com/sphinx-doc/sphinx) from 4.1.2 to 4.2.0.
- [Release notes](https://github.com/sphinx-doc/sphinx/releases)
- [Changelog](https://github.com/sphinx-doc/sphinx/blob/4.x/CHANGES)
- [Commits](sphinx-doc/sphinx@v4.1.2...v4.2.0)

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

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

Author: dependabot[bot]

poetry.lock

@@ -34,7 +34,7 @@ python = ">=3.6.1"
 pydantic = "^1.8.1"
 
 [tool.poetry.dev-dependencies]
-Sphinx = "^4.1.2"
+Sphinx = "^4.2.0"
 #sphinx-pydantic = "0.1.1"
 #sphinx-jsonschema = "1.15"  # See: https://github.com/Zsailer/sphinx-pydantic/pull/6