build(deps-dev): bump sphinx from 7.2.5 to 7.2.6

Bumps [sphinx](https://github.com/sphinx-doc/sphinx) from 7.2.5 to 7.2.6.
- [Release notes](https://github.com/sphinx-doc/sphinx/releases)
- [Changelog](https://github.com/sphinx-doc/sphinx/blob/master/CHANGES)
- [Commits](sphinx-doc/sphinx@v7.2.5...v7.2.6)

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

Signed-off-by: dependabot[bot] <support@github.com>

requirements-dev.txt

@@ -6,4 +6,4 @@ flake8-bugbear==23.7.10
 flake8-import-order==0.18.2
 flake8-requirements==1.7.8
 mypy==1.5.1
-sphinx==7.2.5
+sphinx==7.2.6