Bump sphinx from 4.5.0 to 7.3.7 in /requirements

Bumps [sphinx](https://github.com/sphinx-doc/sphinx) from 4.5.0 to 7.3.7.
- [Release notes](https://github.com/sphinx-doc/sphinx/releases)
- [Changelog](https://github.com/sphinx-doc/sphinx/blob/master/CHANGES.rst)
- [Commits](sphinx-doc/sphinx@v4.5.0...v7.3.7)

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

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

requirements/common.txt

@@ -18,5 +18,5 @@ Pygments==2.17.2
 pykismet3==0.1.1
 requests==2.32.0
 sorl-thumbnail==12.10.0
-Sphinx==4.5.0
+Sphinx==7.3.7
 stripe==2.56.0