Bump sphinx from 7.0.1 to 8.1.0

Bumps [sphinx](https://github.com/sphinx-doc/sphinx) from 7.0.1 to 8.1.0.
- [Release notes](https://github.com/sphinx-doc/sphinx/releases)
- [Changelog](https://github.com/sphinx-doc/sphinx/blob/master/CHANGES.rst)
- [Commits](sphinx-doc/sphinx@v7.0.1...v8.1.0)

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

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

Author: dependabot[bot]

requirements/development.txt

@@ -6,4 +6,4 @@ factory_boy==3.3.0
 flake8==6.0.0
 ipython==8.14.0
 rstcheck==6.1.2
-sphinx==7.0.1
+sphinx==8.1.0