Bump sphinx from 6.2.1 to 7.1.2 (#340)

Bumps [sphinx](https://github.com/sphinx-doc/sphinx) from 6.2.1 to 7.1.2.
- [Release notes](https://github.com/sphinx-doc/sphinx/releases)
- [Changelog](https://github.com/sphinx-doc/sphinx/blob/master/CHANGES.rst)
- [Commits](sphinx-doc/sphinx@v6.2.1...v7.1.2)

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

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Eike Caldeweyher <46899008+f3rmion@users.noreply.github.com>

pyproject.toml

@@ -37,7 +37,7 @@ safety = "^2.3.5"
 mypy = "^1.4"
 typeguard = "^2.13.3"
 xdoctest = {extras = ["colors"], version = "^1.0.0"}
-sphinx = "^6.2.1"
+sphinx = "^7.1.2"
 sphinx-autobuild = "^2021.3.14"
 pre-commit = "^3.3.3"
 flake8 = "^4.0.1"