biz.aQute.tester.junit-platform with JUnit 5.12.x does not discover any tests

When upgrading JUnit from 5.11.x to 5.12.x, the bnd-testing-maven-plugin no longer produces test output.

See: 
* https://bnd.discourse.group/t/anybody-tried-junit-4-12-0-with-maven-bnd-testing-plugin/506
* https://github.com/openhab/openhab-core/pull/4642#issuecomment-2849059359