* Upgrade Mockito from 4.11 to 5.19.
Changelog: https://github.com/mockito/mockito/releases
* Upgrade junit-jupiter from 5.11.4 to 5.13.4
Changelog: https://docs.junit.org/5.13.4/release-notes
* Add workaround to allow junit-jupiter>=5.12 with OSGI
* Activate javaagent for tests to avoid JDK warnings
Signed-off-by: Holger Friedrich <mail@holger-friedrich.de>