Bump doxiaVersion from 2.0.0-M8 to 2.0.0-M9

Bumps `doxiaVersion` from 2.0.0-M8 to 2.0.0-M9.

Updates `org.apache.maven.doxia:doxia-sink-api` from 2.0.0-M8 to 2.0.0-M9
- [Release notes](https://github.com/apache/maven-doxia/releases)
- [Commits](apache/maven-doxia@doxia-2.0.0-M8...doxia-2.0.0-M9)

Updates `org.apache.maven.doxia:doxia-core` from 2.0.0-M8 to 2.0.0-M9
- [Release notes](https://github.com/apache/maven-doxia/releases)
- [Commits](apache/maven-doxia@doxia-2.0.0-M8...doxia-2.0.0-M9)

Updates `org.apache.maven.doxia:doxia-module-xhtml5` from 2.0.0-M8 to 2.0.0-M9

Updates `org.apache.maven.doxia:doxia-module-apt` from 2.0.0-M8 to 2.0.0-M9

Updates `org.apache.maven.doxia:doxia-module-xdoc` from 2.0.0-M8 to 2.0.0-M9

Updates `org.apache.maven.doxia:doxia-module-fml` from 2.0.0-M8 to 2.0.0-M9

Updates `org.apache.maven.doxia:doxia-module-markdown` from 2.0.0-M8 to 2.0.0-M9

---
updated-dependencies:
- dependency-name: org.apache.maven.doxia:doxia-sink-api
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: org.apache.maven.doxia:doxia-core
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: org.apache.maven.doxia:doxia-module-xhtml5
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: org.apache.maven.doxia:doxia-module-apt
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: org.apache.maven.doxia:doxia-module-xdoc
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: org.apache.maven.doxia:doxia-module-fml
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: org.apache.maven.doxia:doxia-module-markdown
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

pom.xml

@@ -198,7 +198,7 @@ under the License.
     <javaVersion>8</javaVersion>
     <!-- for dependencies -->
     <jettyVersion>9.4.53.v20231009</jettyVersion>
-    <doxiaVersion>2.0.0-M8</doxiaVersion>
+    <doxiaVersion>2.0.0-M9</doxiaVersion>
     <doxiaSitetoolsVersion>2.0.0-M16</doxiaSitetoolsVersion>
     <wagonVersion>3.5.3</wagonVersion>
     <slf4jVersion>1.7.36</slf4jVersion>