build(deps): bump sphinx from 7.2.6 to 7.3.7

Bumps [sphinx](https://github.com/sphinx-doc/sphinx) from 7.2.6 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@v7.2.6...v7.3.7)

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

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

requirements.txt

@@ -19,7 +19,7 @@ pytest-xdist>=3.5.0; python_version  >= '3.9'
 pytest-xdist==3.0.2; python_version  < '3.9'
 
 # docs
-Sphinx==7.2.6; python_version >= '3.9'
+Sphinx==7.3.7; python_version >= '3.9'
 Sphinx==5.3.0; python_version  < '3.9'
 recommonmark==0.7.1
 sphinx-rtd-theme==2.0.0