Bump doxiaVersion from 1.11.1 to 1.12.0

Bumps `doxiaVersion` from 1.11.1 to 1.12.0.

Updates `doxia-core` 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)

Updates `doxia-sink-api` 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-core
  dependency-type: direct:production
  update-type: version-update:semver-minor
- 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>

pom.xml

@@ -21,7 +21,7 @@
  <mojo.java.target>1.8</mojo.java.target>
  <project.build.outputTimestamp>1642852333</project.build.outputTimestamp>
 
- <doxiaVersion>1.11.1</doxiaVersion>
+ <doxiaVersion>1.12.0</doxiaVersion>
  <doxia-sitetoolsVersion>1.11.1</doxia-sitetoolsVersion>
 
  <!-- test dependencies -->