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ci: Switch to MPICH in Fedora jobs

Brad King requested to merge brad.king/cmake:ci-fedora34-mpi into master

The OpenMPI package in Fedora 34 requires a CPU with AVX instructions. Some of our CI machines do not have them, and so fail the FindMPI.Test test with SIGILL. Switch to MPICH. Since we test with OpenMPI on the Debian jobs, this covers more MPI vendors anyway.

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