Bump asciidoctor-maven-plugin from 2.1.0 to 2.2.1

Bumps [asciidoctor-maven-plugin](https://github.com/asciidoctor/asciidoctor-maven-plugin) from 2.1.0 to 2.2.1.
- [Release notes](https://github.com/asciidoctor/asciidoctor-maven-plugin/releases)
- [Changelog](https://github.com/asciidoctor/asciidoctor-maven-plugin/blob/main/CHANGELOG.adoc)
- [Commits](asciidoctor/asciidoctor-maven-plugin@asciidoctor-maven-plugin-2.1.0...2.2.1)

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

Author: dependabot-preview[bot]

pom.xml

@@ -58,7 +58,7 @@
         <frontend.maven.plugin.version>1.11.3</frontend.maven.plugin.version>
         <node.version>v16.6.0</node.version>
         <npm.version>7.19.1</npm.version>
-        <asciidoctor.maven.plugin.version>2.1.0</asciidoctor.maven.plugin.version>
+        <asciidoctor.maven.plugin.version>2.2.1</asciidoctor.maven.plugin.version>
         <asciidoctorj.diagram.version>2.1.2</asciidoctorj.diagram.version>
 
         <spring.test.version>5.3.8</spring.test.version>