Bump org.xmlunit:xmlunit-core from 2.11.0 to 2.12.0 (#7572)

Bumps [org.xmlunit:xmlunit-core](https://github.com/xmlunit/xmlunit) from 2.11.0 to 2.12.0.
- [Release notes](https://github.com/xmlunit/xmlunit/releases)
- [Changelog](https://github.com/xmlunit/xmlunit/blob/main/RELEASE_NOTES.md)
- [Commits](xmlunit/xmlunit@v2.11.0...v2.12.0)

---
updated-dependencies:
- dependency-name: org.xmlunit:xmlunit-core
  dependency-version: 2.12.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

build.gradle

@@ -246,8 +246,8 @@ dependencies {
     // 21.0.2 is the latest version. As of Nov 2025, we have moved to OpenJFX 25 so this may cause issues
     testImplementation 'org.testfx:openjfx-monocle:21.0.2'
 
-    testImplementation 'org.xmlunit:xmlunit-matchers:2.11.0'
-    testImplementation 'org.xmlunit:xmlunit-core:2.11.0'
+    testImplementation 'org.xmlunit:xmlunit-matchers:2.12.0'
+    testImplementation 'org.xmlunit:xmlunit-core:2.12.0'
 
     spotbugsPlugins 'com.h3xstream.findsecbugs:findsecbugs-plugin:1.14.0'