Bump sphinx from 4.2.0 to 4.3.0

Bumps [sphinx](https://github.com/sphinx-doc/sphinx) from 4.2.0 to 4.3.0.
- [Release notes](https://github.com/sphinx-doc/sphinx/releases)
- [Changelog](https://github.com/sphinx-doc/sphinx/blob/4.x/CHANGES)
- [Commits](sphinx-doc/sphinx@v4.2.0...v4.3.0)

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

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

poetry.lock

@@ -27,7 +27,7 @@ safety = "^1.10.3"
 mypy = "^0.910"
 typeguard = "^2.13.0"
 xdoctest = {extras = ["colors"], version = "^0.15.10"}
-sphinx = "^4.2.0"
+sphinx = "^4.3.0"
 sphinx-autobuild = "^2021.3.14"
 pre-commit = "^2.15.0"
 flake8 = "^4.0.1"