test mpi4py 3.1.6 #20
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It appears mpi4py 4.0.0 made a change to call MPI large-count APIs.
For example,
MPI.Create_subarrayin python will callMPI_Type_create_subarray_cinternally in mpi4py.See its source codes that implement MPI.Create_subarray
PnetCDF-C 1.13.0 and priors have not supported MPI derived datatypes
constructed from the large-count APIs yet. Thus for the moment, set the
mpi4py version to 3.1.6 for GitHub action tests.
FYI. PnetCDF-C has added the support for large-count datatypes in
its PnetCDF PR #145