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The recent fail was due to building petsc4py via a pip download without a version pin.
This changes the workflow to build petsc4py from the source provided in the package.
Scotch-PT is complaining about needing bison > 3. macOS comes with bison < 3. Despite bison > 3 being installed (keg-only) by Homebrew, I could not get PETSc configure to find it. So I have enabled PETSc's own bison build.