PyMFEM 4.7.1

[sshiraiwa]

Left over from 4.7 and some plans

• Change supported python version to Python >= 3.9
• Numba 0.60.0
• Add Python3.12 (however, numba-scipy is in question)
• ex40.py
• PETSc PETSc support dev #162
• Consider retiring XXXPTR_SIZE_IN typemap