Bump xmlunit-core from 2.8.4 to 2.9.0

Bumps [xmlunit-core](https://github.com/xmlunit/xmlunit) from 2.8.4 to 2.9.0.
- [Release notes](https://github.com/xmlunit/xmlunit/releases)
- [Changelog](https://github.com/xmlunit/xmlunit/blob/main/RELEASE_NOTES.md)
- [Commits](xmlunit/xmlunit@v2.8.4...v2.9.0)

---
updated-dependencies:
- dependency-name: org.xmlunit:xmlunit-core
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

modello-plugins/modello-plugin-dom4j/pom.xml

@@ -37,7 +37,7 @@
     <dependency>
       <groupId>org.xmlunit</groupId>
       <artifactId>xmlunit-core</artifactId>
-      <version>2.8.4</version>
+      <version>2.9.0</version>
       <scope>test</scope>
     </dependency>
   </dependencies>

modello-plugins/modello-plugin-jdom/pom.xml

@@ -43,7 +43,7 @@
     <dependency>
       <groupId>org.xmlunit</groupId>
       <artifactId>xmlunit-core</artifactId>
-      <version>2.8.4</version>
+      <version>2.9.0</version>
       <scope>test</scope>
     </dependency>
   </dependencies>

modello-plugins/modello-plugin-sax/pom.xml

@@ -36,7 +36,7 @@
     <dependency>
       <groupId>org.xmlunit</groupId>
       <artifactId>xmlunit-core</artifactId>
-      <version>2.8.4</version>
+      <version>2.9.0</version>
       <scope>test</scope>
     </dependency>
   </dependencies>

modello-plugins/modello-plugin-stax/pom.xml

@@ -44,7 +44,7 @@
     <dependency>
       <groupId>org.xmlunit</groupId>
       <artifactId>xmlunit-core</artifactId>
-      <version>2.8.4</version>
+      <version>2.9.0</version>
       <scope>test</scope>
     </dependency>
   </dependencies>

modello-plugins/modello-plugin-xdoc/pom.xml

@@ -35,7 +35,7 @@
     <dependency>
       <groupId>org.xmlunit</groupId>
       <artifactId>xmlunit-core</artifactId>
-      <version>2.8.4</version>
+      <version>2.9.0</version>
       <scope>test</scope>
     </dependency>
   </dependencies>

modello-plugins/modello-plugin-xpp3/pom.xml

@@ -31,7 +31,7 @@
     <dependency>
       <groupId>org.xmlunit</groupId>
       <artifactId>xmlunit-core</artifactId>
-      <version>2.8.4</version>
+      <version>2.9.0</version>
       <scope>test</scope>
     </dependency>
   </dependencies>