Bug#1042003: python3-dolfinx: test_vector_function.py fails with PETSc 3.19

[Drew Parsons]

Source: fenics-dolfinx
Followup-For: Bug #1042003
Control: tags 1042003 fixed-upstream

The issue with PETSc 3.19 has been dealt with upstream by a complete
overhaul of the Mesh python wrappers in PR#2611.

The patch does not apply cleanly to dolfinx 0.6.0. A large chunk of
the patches introduces use of C++ template classes. It's not clear
that a blind merge would work successfully.

I think it would be dangerous to try to backport, so we'll wait for
the release of dolfinx 0.7.