Bump @asciidoctor/core from 2.2.6 to 3.0.4

Bumps [@asciidoctor/core](https://github.com/asciidoctor/asciidoctor.js) from 2.2.6 to 3.0.4.
- [Release notes](https://github.com/asciidoctor/asciidoctor.js/releases)
- [Changelog](https://github.com/asciidoctor/asciidoctor.js/blob/main/CHANGELOG.adoc)
- [Commits](asciidoctor/asciidoctor.js@v2.2.6...v3.0.4)

---
updated-dependencies:
- dependency-name: "@asciidoctor/core"
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>