Upgraded doxia.version from 1.11.1 to 1.12.0 (#278)

Bumps `doxia.version` 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] <[email protected]>

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

pom.xml

@@ -36,7 +36,7 @@
   <description>A kotlin DSL for outputting documentation using Doxia.</description>
 
   <properties>
-    <doxia.version>1.11.1</doxia.version>
+    <doxia.version>1.12.0</doxia.version>
     <java.require.version>11</java.require.version>
     <jdeps.multiRelease>11</jdeps.multiRelease>
     <kotlin.version>1.6.21</kotlin.version>