Bump asciidoctorj from 2.1.0 to 2.4.0 (#179)
Bump asciidoctorj from 2.1.0 to 2.4.0 (#179)

Bumps [asciidoctorj](https://github.com/asciidoctor/asciidoctorj) from 2.1.0 to 2.4.0.
- [Release notes](https://github.com/asciidoctor/asciidoctorj/releases)
- [Changelog](https://github.com/asciidoctor/asciidoctorj/blob/master/CHANGELOG.adoc)
- [Commits](https://github.com/asciidoctor/asciidoctorj/compare/v2.1.0...v2.4.0)

Signed-off-by: dependabot-preview[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>

Co-authored-by: dependabot-preview[bot] <6a4c1c4838f800d1998274cd5234e1f65c55e90c@users.noreply.github.com>
spring-cloud/spring-cloud-build,spring-cloud/spring-cloud-build