Update sphinx requirement from ~=7.3.7 to ~=7.4.4 (#408)

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@v7.3.7...v7.4.4)

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

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

docs/requirements-doc.txt

@@ -1,5 +1,5 @@
 -e .
 myst-parser~=3.0
-sphinx~=7.3.7
+sphinx~=7.4.4
 furo==2024.5.6
 types-docutils~=0.21