Bump doxia-sink-api from 1.11.1 to 1.12.0 (#111)

Bumps [doxia-sink-api](https://github.com/apache/maven-doxia) from 1.11.1 to 1.12.0.
- [Release notes](https://github.com/apache/maven-doxia/releases)
- [Commits](apache/maven-doxia@doxia-1.11.1...doxia-1.12.0)

---
updated-dependencies:
- dependency-name: org.apache.maven.doxia:doxia-sink-api
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

pom.xml

@@ -86,7 +86,7 @@ under the License.
 
   <properties>
     <mavenVersion>3.2.5</mavenVersion>
-    <doxiaVersion>1.11.1</doxiaVersion>
+    <doxiaVersion>1.12.0</doxiaVersion>
     <doxiaSitetoolsVersion>1.11.1</doxiaSitetoolsVersion>
     <javaVersion>8</javaVersion><!-- Because PMD 6.35.0+ requires Java 8 -->
     <pmdVersion>6.55.0</pmdVersion>