Bump sphinx from 6.1.3 to 7.3.7 in /docs (#406)

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] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Pete Gadomski <[email protected]>

Author: dependabot[bot]

docs/requirements.txt

@@ -1,4 +1,4 @@
 furo==2024.4.27
-sphinx==6.1.3
+sphinx==7.3.7
 sphinx-click==5.1.0
 myst_parser==3.0.0