switch to openpmix 4.2.2

[garlick]

This pushes the version of openpmix that we build against forward to 4.2.2. In addition, it reverts the lock-in of ompi-v5.0.0rc2 in CI.

[codecov[bot]]

Codecov Report

Merging #67 (77a3c1f) into main (deba2b4) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##             main      #67   +/-   ##
=======================================
  Coverage   79.03%   79.03%           
=======================================
  Files          10       10           
  Lines        1207     1207           
=======================================
  Hits          954      954           
  Misses        253      253           

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[garlick]

Thanks!