(v2.2.x): Bump org.asciidoctor:asciidoctorj from 2.5.12 to 2.5.13 (#844)

Bumps [org.asciidoctor:asciidoctorj](https://github.com/asciidoctor/asciidoctorj) from 2.5.12 to 2.5.13.
- [Release notes](https://github.com/asciidoctor/asciidoctorj/releases)
- [Changelog](https://github.com/asciidoctor/asciidoctorj/blob/v2.5.13/CHANGELOG.adoc)
- [Commits](asciidoctor/asciidoctorj@v2.5.12...v2.5.13)

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

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

Diff for: pom.xml

@@ -74,7 +74,7 @@
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <project.java.version>1.8</project.java.version>
         <project.execution.environment>JavaSE-1.8</project.execution.environment>
-        <asciidoctorj.version>2.5.12</asciidoctorj.version>
+        <asciidoctorj.version>2.5.13</asciidoctorj.version>
         <jruby.version>9.4.6.0</jruby.version>
         <maven.coveralls.plugin.version>4.3.0</maven.coveralls.plugin.version>
         <maven.jacoco.plugin.version>0.8.12</maven.jacoco.plugin.version>