This is the never ending problem of released modules still depending on a SNAPSHOT version of the Ref App distro… It turns out that Reference Metadata version 2.4 depends on distro 2.4-SNAPSHOT.
This is a tricky situation and there is no easy workaround here. You may try to depend on 2.5-SNAPSHOT then instead of 2.4 but we haven’t tested this yet and I can’t guarantee that this will work.