Bump org.asciidoctor:asciidoctor-maven-plugin from 2.2.5 to 2.2.6

Bumps [org.asciidoctor:asciidoctor-maven-plugin](https://github.com/asciidoctor/asciidoctor-maven-plugin) from 2.2.5 to 2.2.6.
- [Release notes](https://github.com/asciidoctor/asciidoctor-maven-plugin/releases)
- [Changelog](https://github.com/asciidoctor/asciidoctor-maven-plugin/blob/asciidoctor-maven-plugin-2.2.6/CHANGELOG.adoc)
- [Commits](asciidoctor/asciidoctor-maven-plugin@asciidoctor-maven-plugin-2.2.5...asciidoctor-maven-plugin-2.2.6)

---
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]>

pom.xml

@@ -294,7 +294,7 @@
             if they are not otherwise used.
          -->
         <version.ant.junit>1.10.14</version.ant.junit>
-        <version.asciidoctor.plugin>2.2.5</version.asciidoctor.plugin>
+        <version.asciidoctor.plugin>2.2.6</version.asciidoctor.plugin>
         <version.org.jacoco>0.8.11</version.org.jacoco>
         <version.org.jboss.galleon>6.0.0.Beta2</version.org.jboss.galleon>
         <version.org.wildfly.glow>1.0.0.Beta7</version.org.wildfly.glow>