Bump xmlunit-legacy from 2.7.0 to 2.9.0

Bumps [xmlunit-legacy](https://github.com/xmlunit/xmlunit) from 2.7.0 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@v2.7.0...v2.9.0)

---
updated-dependencies:
- dependency-name: org.xmlunit:xmlunit-legacy
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

pom.xml

@@ -248,7 +248,7 @@
     <dependency>
       <groupId>org.xmlunit</groupId>
       <artifactId>xmlunit-legacy</artifactId>
-      <version>2.7.0</version>
+      <version>2.9.0</version>
       <scope>test</scope>
     </dependency>
     <dependency>