Bump sphinx-issues from 3.0.1 to 4.0.0 (#879)

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: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

@@ -48,7 +48,7 @@ docs = [
   "apispec[marshmallow]",
   "pyyaml==6.0.1",
   "sphinx==7.2.6",
-  "sphinx-issues==3.0.1",
+  "sphinx-issues==4.0.0",
   "sphinx-rtd-theme==2.0.0",
 ]
 tests = ["apispec[yaml,marshmallow]", "openapi-spec-validator==0.7.1", "pytest"]