Merge pull request #157 from rabbitmq/dependabot/maven/org.asciidoctor-asciidoctorj-pdf-2.1.6

Bump asciidoctorj-pdf from 2.1.4 to 2.1.6

Author: acogoluegnes

pom.xml

@@ -83,7 +83,7 @@
     <maven.jar.plugin.version>3.2.2</maven.jar.plugin.version>
     <asciidoctor.maven.plugin.version>2.2.2</asciidoctor.maven.plugin.version>
     <asciidoctorj.version>2.5.4</asciidoctorj.version>
-    <asciidoctorj.pdf.version>2.1.4</asciidoctorj.pdf.version>
+    <asciidoctorj.pdf.version>2.1.6</asciidoctorj.pdf.version>
     <asciidoctorj.diagram.version>2.2.3</asciidoctorj.diagram.version>
     <buildnumber.plugin.version>1.4</buildnumber.plugin.version>
     <jruby.version>9.3.4.0</jruby.version>