Bump org.asciidoctor:asciidoctor-maven-plugin from 2.2.1 to 3.1.1

Bumps [org.asciidoctor:asciidoctor-maven-plugin](https://github.com/asciidoctor/asciidoctor-maven-plugin) from 2.2.1 to 3.1.1.
- [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-2.2.1...asciidoctor-maven-tools-3.1.1)

---
updated-dependencies:
- dependency-name: org.asciidoctor:asciidoctor-maven-plugin
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

docbook/pom.xml

@@ -16,7 +16,7 @@
       <plugin>
         <groupId>org.asciidoctor</groupId>
         <artifactId>asciidoctor-maven-plugin</artifactId>
-        <version>2.2.1</version>
+        <version>3.1.1</version>
         <dependencies>
           <dependency>
             <groupId>org.asciidoctor</groupId>