Bump asciidoctor-maven-plugin from 2.2.3 to 2.2.4

Bumps [asciidoctor-maven-plugin](https://github.com/asciidoctor/asciidoctor-maven-plugin) from 2.2.3 to 2.2.4.
- [Release notes](https://github.com/asciidoctor/asciidoctor-maven-plugin/releases)
- [Changelog](https://github.com/asciidoctor/asciidoctor-maven-plugin/blob/asciidoctor-maven-plugin-2.2.4/CHANGELOG.adoc)
- [Commits](asciidoctor/asciidoctor-maven-plugin@asciidoctor-maven-plugin-2.2.3...asciidoctor-maven-plugin-2.2.4)

---
updated-dependencies:
- dependency-name: org.asciidoctor:asciidoctor-maven-plugin
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

pom.xml

@@ -413,7 +413,7 @@
 
         <!-- Asciidoctor -->
 
-        <version.asciidoctor.plugin>2.2.3</version.asciidoctor.plugin>
+        <version.asciidoctor.plugin>2.2.4</version.asciidoctor.plugin>
         <version.org.hibernate.infra.hibernate-asciidoctor-theme>1.0.6.Final</version.org.hibernate.infra.hibernate-asciidoctor-theme>
         <version.org.jruby>9.3.2.0</version.org.jruby>
         <version.org.asciidoctor.asciidoctorj>2.5.6</version.org.asciidoctor.asciidoctorj>