Bump sphinx from 6.1.3 to 7.3.7

Bumps [sphinx](https://github.com/sphinx-doc/sphinx) from 6.1.3 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@v6.1.3...v7.3.7)

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

Signed-off-by: dependabot[bot] <support@github.com>

docs/requirements.txt

@@ -1,2 +1,2 @@
-Sphinx==6.1.3
+Sphinx==7.3.7
 sphinx-rtd-theme==1.3.0