Update sphinx requirement from ~=7.1.2 to ~=7.3.4

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/master/CHANGES.rst)
- [Commits](sphinx-doc/sphinx@v7.1.2...v7.3.4)

---
updated-dependencies:
- dependency-name: sphinx
  dependency-type: direct:production
...

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

docs/requirements-doc.txt

@@ -1,5 +1,5 @@
 -e .
 myst-parser~=2.0
-sphinx~=7.1.2
+sphinx~=7.3.4
 furo==2024.1.29
 types-docutils~=0.20