Bump asciidoctorj-pdf from 1.6.2 to 2.0.3

Bumps [asciidoctorj-pdf](https://github.com/asciidoctor/asciidoctorj-pdf) from 1.6.2 to 2.0.3.
- [Release notes](https://github.com/asciidoctor/asciidoctorj-pdf/releases)
- [Commits](asciidoctor/asciidoctorj-pdf@v1.6.2...v2.0.3)

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

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

Author: dependabot[bot]

pom.xml

@@ -84,7 +84,7 @@
     <maven.jar.plugin.version>3.2.2</maven.jar.plugin.version>
     <asciidoctor.maven.plugin.version>2.2.2</asciidoctor.maven.plugin.version>
     <asciidoctorj.version>2.5.3</asciidoctorj.version>
-    <asciidoctorj.pdf.version>1.6.2</asciidoctorj.pdf.version>
+    <asciidoctorj.pdf.version>2.0.3</asciidoctorj.pdf.version>
     <asciidoctorj.diagram.version>2.2.1</asciidoctorj.diagram.version>
     <buildnumber.plugin.version>1.4</buildnumber.plugin.version>
     <jruby.version>9.3.4.0</jruby.version>