Bump sphinx from 7.4.5 to 8.0.2 (#605)

Bumps [sphinx](https://github.com/sphinx-doc/sphinx) from 7.4.5 to 8.0.2.
- [Release notes](https://github.com/sphinx-doc/sphinx/releases)
- [Changelog](https://github.com/sphinx-doc/sphinx/blob/master/CHANGES.rst)
- [Commits](sphinx-doc/sphinx@v7.4.5...v8.0.2)

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

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

pyproject.toml

@@ -25,7 +25,7 @@ Issues = "https://github.com/marshmallow-code/marshmallow-sqlalchemy/issues"
 Source = "https://github.com/marshmallow-code/marshmallow-sqlalchemy"
 
 [project.optional-dependencies]
-docs = ["sphinx==7.4.5", "alabaster==1.0.0", "sphinx-issues==4.1.0"]
+docs = ["sphinx==8.0.2", "alabaster==1.0.0", "sphinx-issues==4.1.0"]
 tests = ["pytest<9", "pytest-lazy-fixtures"]
 dev = ["marshmallow-sqlalchemy[tests]", "tox", "pre-commit~=3.5"]