build(deps): bump xmlunit.version from 2.10.3 to 2.10.4

Bumps `xmlunit.version` from 2.10.3 to 2.10.4.

Updates `org.xmlunit:xmlunit-legacy` from 2.10.3 to 2.10.4
- [Release notes](https://github.com/xmlunit/xmlunit/releases)
- [Changelog](https://github.com/xmlunit/xmlunit/blob/main/RELEASE_NOTES.md)
- [Commits](xmlunit/xmlunit@v2.10.3...v2.10.4)

Updates `org.xmlunit:xmlunit-assertj3` from 2.10.3 to 2.10.4
- [Release notes](https://github.com/xmlunit/xmlunit/releases)
- [Changelog](https://github.com/xmlunit/xmlunit/blob/main/RELEASE_NOTES.md)
- [Commits](xmlunit/xmlunit@v2.10.3...v2.10.4)

---
updated-dependencies:
- dependency-name: org.xmlunit:xmlunit-legacy
  dependency-version: 2.10.4
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: org.xmlunit:xmlunit-assertj3
  dependency-version: 2.10.4
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

pom.xml

@@ -490,7 +490,7 @@
         <spring.version>6.2.10</spring.version>
         <wsdl4j.version>1.6.3</wsdl4j.version>
         <xmlbeans.version>5.3.0</xmlbeans.version>
-        <xmlunit.version>2.10.3</xmlunit.version>
+        <xmlunit.version>2.10.4</xmlunit.version>
         <xml_resolver.version>1.2</xml_resolver.version>
         <commons.cli.version>1.10.0</commons.cli.version>
         <!-- The build failing if tests are skipped is very annoying -->