Update sphinx requirement from >=5.0.2 to >=7.4.7

Updates the requirements on [sphinx](https://github.com/sphinx-doc/sphinx) to permit the latest version.
- [Release notes](https://github.com/sphinx-doc/sphinx/releases)
- [Changelog](https://github.com/sphinx-doc/sphinx/blob/v7.4.7/CHANGES.rst)
- [Commits](sphinx-doc/sphinx@v5.0.2...v7.4.7)

---
updated-dependencies:
- dependency-name: sphinx
  dependency-version: 7.4.7
  dependency-type: direct:development
...

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

Author: dependabot[bot]

requirements-dev.txt

@@ -3,4 +3,4 @@ mypy>=0.961
 # Include modules used for development
 pylint>=2.14.4
 pytest>=8.4.2
-sphinx>=5.0.2
+sphinx>=7.4.7