Pyside6/Shiboken and ABCMeta Bug

This is specific to the new Pyside6 package. Pyside2 does not have this issue.

When attempting to create an abstract class combining JSON and QObject classes Shiboken throws:

{{ c:\python\python39\lib\abc.py in _new_(mcls, name, bases, namespace, **kwargs) 104 """
105 def _new_(mcls, name, bases, namespace, **kwargs):
--> 106 cls = super()._new_(mcls, name, bases, namespace, **kwargs)
107 _abc_init(cls)
108 return cls
TypeError: Shiboken.ObjectType._new(JsonSettingsQtMeta) is not safe, use type.new_()}}

Attaching minimal examples showing the issue. Some duplicated/modified from:
https://bugreports.qt.io/browse/PYSIDE-1051

https://stackoverflow.com/questions/66591752/metaclass-conflict-when-trying-to-create-a-python-abstract-class-that-also-subcl

 https://github.com/sausix/python-abcmeta-workaround