switch back to regular wiremock but with jetty12 support

[bgalek]

When using hermes-mock with wiremock-jetty12 tests in such project will have problem choosing property wiremock version (since wiremock-standalone will be on their classpath).

This should make builds faster and more accessible for people to use :)

[szczygiel-m]

Hey, thanks for the contribution! 🎉 It seems that after your change the unit tests are not passing, could you take a look at it?

[bgalek]

yeah, I'll look into that :)