Bump org.asciidoctor:asciidoctorj-diagram from 2.2.11 to 2.2.13

Bumps [org.asciidoctor:asciidoctorj-diagram](https://github.com/asciidoctor/asciidoctorj-diagram) from 2.2.11 to 2.2.13.
- [Release notes](https://github.com/asciidoctor/asciidoctorj-diagram/releases)
- [Commits](asciidoctor/asciidoctorj-diagram@v2.2.11...v2.2.13)

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

Signed-off-by: dependabot[bot] <support@github.com>

coherence-spring-site/pom.xml

@@ -25,7 +25,7 @@
 	<properties>
 		<coherence.spring.root>${basedir}/..</coherence.spring.root>
 		<helidon.sitegen.version>3.0.5</helidon.sitegen.version>
-		<asciidoctor.diagram.version>2.2.11</asciidoctor.diagram.version>
+		<asciidoctor.diagram.version>2.2.13</asciidoctor.diagram.version>
 		<doxia.version>1.11.1</doxia.version>
 
 		<timestamp>${maven.build.timestamp}</timestamp>