[bot]: Bump org.asciidoctor:asciidoctor-maven-plugin from 2.2.3 to 2.2.4

Bumps [org.asciidoctor: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] <[email protected]>

Author: dependabot[bot]

build/optaplanner-build-parent/pom.xml

@@ -65,7 +65,7 @@
 
     <!-- Plugin version properties -->
 
-    <version.asciidoctor.plugin>2.2.3</version.asciidoctor.plugin>
+    <version.asciidoctor.plugin>2.2.4</version.asciidoctor.plugin>
     <version.assembly.plugin>3.4.2</version.assembly.plugin>
     <!-- jboss suffixed version from jboss-parent which cannot be downloaded due to SNAPSHOT only policy for plugins from JBoss -->
     <version.compiler.plugin>3.8.1</version.compiler.plugin>