Allow testing with maven-it-extension and JUnit 5

[robertk3s]

Hi,

I would like try to reproduce #111 with a test but had some troubles getting it done with takari. I would like to use a different approach using:
https://dzone.com/articles/maven-plugin-testing-in-a-modern-way-part-i
https://github.com/khmarbaise/maven-it-extension

And that would might be helpful for future tests as well. However this is a JUnit 5 extension, so the project would need to support JUnit5.
So if possible, I would like to add JUnit 5 with the vintage engine to support both testing approaches.
(see https://junit.org/junit5/docs/current/user-guide/#migrating-from-junit4-running)
I would do this change in a PR.