eospac version bump to 6.4.0beta.4 (#10294)
eospac version bump to 6.4.0beta.4 (#10294)


LLNL/spack,iulian787/spack,iulian787/spack,LLNL/spack,LLNL/spack,iulian787/spack,LLNL/spack,LLNL/spack,iulian787/spack,iulian787/spack