Bump sphinx-issues from 3.0.1 to 4.0.0 (#558)

Bumps [sphinx-issues](https://github.com/sloria/sphinx-issues) from 3.0.1 to 4.0.0.
- [Commits](sloria/sphinx-issues@3.0.1...4.0.0)

---
updated-dependencies:
- dependency-name: sphinx-issues
  dependency-type: direct:development
  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==7.2.6", "alabaster==0.7.16", "sphinx-issues==3.0.1"]
+docs = ["sphinx==7.2.6", "alabaster==0.7.16", "sphinx-issues==4.0.0"]
 # TODO: Remove pytest pin when https://github.com/TvoroG/pytest-lazy-fixture/issues/65 is resolved
 tests = ["pytest<8", "pytest-lazy-fixture>=0.6.2"]
 dev = ["marshmallow-sqlalchemy[tests]", "tox", "pre-commit~=3.5"]