Merge pull request #192 from rabbitmq/dependabot/maven/org.asciidoctor-asciidoctorj-2.5.6

Bump asciidoctorj from 2.5.5 to 2.5.6

Author: acogoluegnes

pom.xml

@@ -84,7 +84,7 @@
     <maven-javadoc-plugin.version>3.4.1</maven-javadoc-plugin.version>
     <maven.jar.plugin.version>3.3.0</maven.jar.plugin.version>
     <asciidoctor.maven.plugin.version>2.2.2</asciidoctor.maven.plugin.version>
-    <asciidoctorj.version>2.5.5</asciidoctorj.version>
+    <asciidoctorj.version>2.5.6</asciidoctorj.version>
     <asciidoctorj.pdf.version>2.3.0</asciidoctorj.pdf.version>
     <asciidoctorj.diagram.version>2.2.3</asciidoctorj.diagram.version>
     <buildnumber.plugin.version>1.4</buildnumber.plugin.version>