boost: new variants for version 1.73.0

New module variant

Name: boost/1.73.0_slurm
Group: MPI
with: gcc/{7.5.0,8.4.0,9.3.0} openmpi/4.0.5_slurm b:zlib/1.2.11
System: merlin6
Overlay psi

To upload designs, you'll need to enable LFS. More information