Bump sphinx from 7.3.6 to 7.3.7 (#310)

Bumps [sphinx](https://github.com/sphinx-doc/sphinx) from 7.3.6 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@v7.3.6...v7.3.7)

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

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

pyproject.toml

@@ -31,7 +31,7 @@ Funding = "https://opencollective.com/marshmallow"
 [project.optional-dependencies]
 docs = [
   "marshmallow-sqlalchemy>=0.19.0",
-  "Sphinx==7.3.6",
+  "Sphinx==7.3.7",
   "sphinx-issues==4.1.0",
 ]
 tests = ["flask-marshmallow[sqlalchemy]", "pytest"]