Update RSC (rocm toolchain, mpich, cce), spack and spack-packages

[adrienbernede]

• Update to rocm 6.4.3 and mpich 8.1.33, then with mpich 9.0.1
• Update to spack 1.1.1 (concretizer perf improvements)
• Update to cce 21
• Add one job with rocm 7.2 and mpich 9.1, keep rocm 6.4.3 for most specs (production state).
• Merge Update RSC (rocm toolchain, mpich, cce), spack and spack-packages RAJA#1999 first and update tpl/RAJA.

[rhornung67]

@adrienbernede where is the cray-mpich version defined? Above, you say move to 8.1.33. That version is old. We should be using version 9.0.1. I think a new version will be arriving in the near future.