Bump org.asciidoctor:asciidoctor-maven-plugin from 2.2.3 to 2.2.4 (#692)

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]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

wicket-user-guide/pom.xml

@@ -31,7 +31,7 @@
 	</description>
 
 	<properties>
-		<asciidoctor-maven-plugin.version>2.2.3</asciidoctor-maven-plugin.version>
+		<asciidoctor-maven-plugin.version>2.2.4</asciidoctor-maven-plugin.version>
 		<japicmp.skip>true</japicmp.skip>
 	</properties>