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