Merge branch '108-hdf5-release-version-1-10-6-parallel-as-stable' into 'master'

Resolve "hdf5: release version 1.10.6 parallel as stable"

Closes #108

See merge request Pmodules/buildblocks!143

MPI/hdf5/files/variants.merlin6

-hdf5/1.10.6_slurm	unstable	gcc/{7.5.0,8.4.0,9.3.0} openmpi/3.1.6_slurm
+hdf5/1.10.6_slurm	stable	gcc/{7.5.0,8.4.0,9.3.0} openmpi/3.1.6_slurm
 

MPI/hdf5/files/variants.rhel6

@@ -37,4 +37,4 @@ hdf5/1.10.4 	stable    	gcc/{5.5.0,6.4.0,7.3.0,8.2.0} openmpi/3.1.3
 hdf5/1.10.4 	stable    	gcc/7.3.0 mpich/3.3
 
 hdf5/1.10.5	stable		gcc/{7.4.0,8.3.0} openmpi/3.1.4
-hdf5/1.10.6	unstable	gcc/{7.5.0,8.4.0,9.3.0,10.1.0} openmpi/3.1.6
+hdf5/1.10.6	stable		gcc/{7.5.0,8.4.0,9.3.0,10.1.0} openmpi/3.1.6