Bump org.xmlunit:xmlunit-core in the test-tools group

Bumps the test-tools group with 1 update: [org.xmlunit:xmlunit-core](https://github.com/xmlunit/xmlunit).


Updates `org.xmlunit:xmlunit-core` from 2.10.2 to 2.10.3
- [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/v2.10.2...v2.10.3)

---
updated-dependencies:
- dependency-name: org.xmlunit:xmlunit-core
  dependency-version: 2.10.3
  dependency-type: direct:development
  update-type: version-update:semver-patch
  dependency-group: test-tools
...

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

dspace-api/pom.xml

@@ -788,7 +788,7 @@
         <dependency>
             <groupId>org.xmlunit</groupId>
             <artifactId>xmlunit-core</artifactId>
-            <version>2.10.2</version>
+            <version>2.10.3</version>
             <scope>test</scope>
         </dependency>