Bump org.xmlunit:xmlunit-core from 2.9.0 to 2.10.0 in /validator

Bumps [org.xmlunit:xmlunit-core](https://github.com/xmlunit/xmlunit) from 2.9.0 to 2.10.0.
- [Release notes](https://github.com/xmlunit/xmlunit/releases)
- [Changelog](https://github.com/xmlunit/xmlunit/blob/main/RELEASE_NOTES.md)
- [Commits](https://github.com/xmlunit/xmlunit/compare/v2.9.0...v2.10.0)

---
updated-dependencies:
- dependency-name: org.xmlunit:xmlunit-core
  dependency-type: direct:development
...

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

validator/pom.xml

@@ -114,7 +114,7 @@
         <dependency>
             <groupId>org.xmlunit</groupId>
             <artifactId>xmlunit-core</artifactId>
-            <version>2.9.0</version>
+            <version>2.10.0</version>
             <scope>test</scope>
         </dependency>
         <dependency>