Bump doxiaVersion from 1.10 to 1.11.1

Bumps `doxiaVersion` from 1.10 to 1.11.1.

Updates `doxia-sink-api` from 1.10 to 1.11.1
- [Release notes](https://github.com/apache/maven-doxia/releases)
- [Commits](apache/maven-doxia@doxia-1.10...doxia-1.11.1)

Updates `doxia-core` from 1.10 to 1.11.1
- [Release notes](https://github.com/apache/maven-doxia/releases)
- [Commits](apache/maven-doxia@doxia-1.10...doxia-1.11.1)

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

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

pom.xml

@@ -67,7 +67,7 @@ under the License.
   <properties>
     <javaVersion>8</javaVersion>
     <mavenVersion>3.2.5</mavenVersion>
-    <doxiaVersion>1.10</doxiaVersion>
+    <doxiaVersion>1.11.1</doxiaVersion>
     <doxiaSitetoolsVersion>1.10</doxiaSitetoolsVersion>
     <beanshell-groupId>org.apache-extras.beanshell</beanshell-groupId>
     <beanshell-artifactId>bsh</beanshell-artifactId>