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] <support@github.com>

pom.xml

@@ -38,7 +38,7 @@
     </scm>
 
     <properties>
-        <version.asciidoctor-maven-plugin>2.2.5</version.asciidoctor-maven-plugin>
+        <version.asciidoctor-maven-plugin>2.2.6</version.asciidoctor-maven-plugin>
         <version.org.asciidoctor.asciidoctorj-pdf>2.3.10</version.org.asciidoctor.asciidoctorj-pdf>
     </properties>