Bump xmlunit-core from 2.8.3 to 2.9.0

Bumps [xmlunit-core](https://github.com/xmlunit/xmlunit) from 2.8.3 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@v2.8.3...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] <support@github.com>

Author: dependabot[bot]

parent/pom.xml

@@ -170,7 +170,7 @@
       <dependency>
         <groupId>org.xmlunit</groupId>
         <artifactId>xmlunit-core</artifactId>
-        <version>2.8.3</version>
+        <version>2.9.0</version>
       </dependency>
       <dependency>
         <groupId>org.zeroturnaround</groupId>