chore(deps): Update sphinx requirement from ~=7.2.6 to ~=7.3.7

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/master/CHANGES.rst)
- [Commits](sphinx-doc/sphinx@v7.2.6...v7.3.7)

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

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

requirements.txt

@@ -1,4 +1,4 @@
-Sphinx~=7.2.6
+Sphinx~=7.3.7
 furo~=2024.1.29
 #myst-parser~=1.0.0
 git+https://github.com/executablebooks/MyST-Parser@80b892f