For Python3.12 mvapich build, pinned build tools to fix petsc4py, SymPy to avoid FFC/FIAT crash #4
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Added pip3 install --upgrade pip setuptools wheel.
Pinned Cython to 3.0.x: pip3 install "Cython>=3.0,<3.1" to avoid the Cython 3.1.x crash in petsc4py 3.20.x.
Installed petsc4py/slepc4py with --no-build-isolation and explicit PETSC_DIR / SLEPC_DIR so they use the preinstalled Cython.
pip3 install "sympy>=1.12.1,<1.14"