PGI/NVHPC: Remove -Mipa compiler option for 23.3+

`-Mipa` was removed since 23.3.  The compiler warns about it:

    nvfortran-Warning-The option -Mipa has been deprecated and is ignored.

See: https://docs.nvidia.com/hpc-sdk/archive/23.9/hpc-sdk-release-notes/index.html#deprecations
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