deps: 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]>

Author: dependabot[bot]

build/build-parent/pom.xml

@@ -42,7 +42,7 @@
     <!-- Plugins -->
     <!-- ************************************************************************ -->
     <version.antrun.plugin>3.1.0</version.antrun.plugin>
-    <version.asciidoctor.plugin>2.2.5</version.asciidoctor.plugin>
+    <version.asciidoctor.plugin>2.2.6</version.asciidoctor.plugin>
     <version.assembly.plugin>3.6.0</version.assembly.plugin>
     <version.compiler.plugin>3.12.1</version.compiler.plugin>
     <version.dependency.plugin>3.6.1</version.dependency.plugin>