Bump sphinx from 4.4.0 to 7.3.7 in /docs

Bumps [sphinx](https://github.com/sphinx-doc/sphinx) from 4.4.0 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@v4.4.0...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]>

docs/api/requirements.txt

@@ -2,4 +2,4 @@
 
 pydata-sphinx-theme==0.8.0
 myst-parser==0.17.0
-Sphinx==4.4.0
+Sphinx==7.3.7