pythonPackages.shiboken2: mark as broken on Python ≥ 3.12 (#314968)
shiboken2 uses distutils, which was removed in Python 3.12.
This is the case in the currently packaged shiboken2 5.15.11,
as well as in the latest 5.x upstream release 5.15.12.
We can't use the 6.x releases, as those are for shiboken6,
not shiboken2.