Bump sphinx-issues from 3.0.1 to 4.0.0 (#432)

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>

requirements/docs.txt

@@ -4,7 +4,7 @@ Sphinx>4,<8
 sphinx-autobuild==2021.3.14
 sphinx-copybutton==0.5.2
 sphinx-inline-tabs==2023.4.21
-sphinx-issues==3.0.1
+sphinx-issues==4.0.0
 sphinxext-opengraph==0.9.1
 sphinx-paramlinks==0.6.0
 sphinxcontrib-programoutput==0.17