gpu: HPC SDK 21.5, Singularity, HPCX MPI update

[kenhester]

No description provided.

[codecov]

Codecov Report

Merging #1709 (0482ee5) into master (f1525c6) will decrease coverage by 33.21%.
The diff coverage is n/a.

❗ Current head 0482ee5 differs from pull request most recent head 3706ef1. Consider uploading reports for the commit 3706ef1 to get more accurate results

@@             Coverage Diff             @@
##           master    #1709       +/-   ##
===========================================
- Coverage   88.78%   55.57%   -33.22%     
===========================================
  Files         208      203        -5     
  Lines       33468    32888      -580     
  Branches     4352     4314       -38     
===========================================
- Hits        29716    18277    -11439     
- Misses       3260    14044    +10784     
- Partials      492      567       +75     

Impacted Files	Coverage Δ
tests/test_buffering.py	6.81% <0.00%> (-91.67%)	⬇️
examples/seismic/viscoacoustic/operators.py	8.81% <0.00%> (-91.19%)	⬇️
examples/seismic/self_adjoint/operators.py	9.23% <0.00%> (-90.77%)	⬇️
tests/test_dimension.py	9.81% <0.00%> (-90.19%)	⬇️
tests/test_skewing.py	10.86% <0.00%> (-88.05%)	⬇️
tests/test_dse.py	12.91% <0.00%> (-86.88%)	⬇️
tests/test_caching.py	12.99% <0.00%> (-86.78%)	⬇️
tests/test_operator.py	12.94% <0.00%> (-84.89%)	⬇️
tests/test_checkpointing.py	15.21% <0.00%> (-84.79%)	⬇️
tests/test_lower_exprs.py	15.25% <0.00%> (-84.75%)	⬇️
... and 147 more

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[FabioLuporini]

Fantastic, many thanks. Merging