cgns package: add version 3.4.0 and update hdf5 dependency (#10803)
cgns package: add version 3.4.0 and update hdf5 dependency (#10803)

* Add version 3.4.0
* Update checksums for older versions to sha256
* Require hdf5~mpi when building with ~mpi
LLNL/spack,iulian787/spack,iulian787/spack,iulian787/spack,iulian787/spack,LLNL/spack,LLNL/spack,iulian787/spack,LLNL/spack,LLNL/spack