[mypyc] Fix 3.12 issue with pickling of instances with __dict__ #15574
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This fixes the testPickling test case in mypyc/test-data/run-classes.test on Python 3.12.
Handle another case that was missed in #15471. On 3.12 we rely on Py_TPFLAGS_MANAGED_DICT and shouldn't define an explicit
__dict__
member.Work on mypyc/mypyc#995.