Update the versions used in the JDG 6.3, JDG 6.4, and Infinispan 7 POMs

Well, right now the JDG 6.4 plugin won't compile, because there is no Infinispan version 6.4.0, and there is no guarantee that 6.2.0.Final-redhat-1 will be the final version. I still think pushing the most current versions into the repo is the easiest solution for those of us who can access the internal versions.