With this ticket, we want to bump the JUnit version to 5.12.2.

We do not expect problems. The mentioned deprecations do not affect us.
Changelog: https://junit.org/junit5/docs/current/release-notes/index.html#release-notes-5.12.2

Interesting new features:
- Thread dumps on test timeouts
- Parameterized test validation improvements
- JRE-based conditions such as @EnabledOnJre and @DisabledForJreRange now support arbitrary Java versions