[BUG] null-deref inside _PyObject_GC_UNTRACK from extention class dealloc method.

[fried]

Describe the bug

SCARINESS: 10 (null-deref)
    #0 0x53c9a5 in _PyObject_GC_UNTRACK(_object*) (.__uniq.71160431842585912442991593982683040670) python/3.10/Include/internal/pycore_object.h:123
    #1 0x53c9a5 in BaseException_dealloc(PyBaseExceptionObject*) (.__uniq.71160431842585912442991593982683040670) python/3.10/Objects/exceptions.c:92
    #2 0x7fb1f0bcfea7 in __pyx_tp_dealloc_6thrift_3py3_10exceptions_GeneratedError(_object*) exceptions.cpp:20592 *cython*
    #3 0x7fb1f4369b4f in __pyx_tp_dealloc_7testing_5types_UnusedError(_object*) types.cpp:165249  *cython* 
    #4 0x3d3658 in _Py_Dealloc python/3.10/Objects/object.c:2301

I believe this is related to this commit 663c924 from #5432

The generated .cpp code between the old version of cython and 3.0.8 is missing these lines

#if CYTHON_USE_TYPE_SLOTS
if (PyType_IS_GC(Py_TYPE(o)->tp_base))
#endif
PyObject_GC_Track(o);

The missing GC_Track would explain why GC is exploding

Code to reproduce the behaviour:

# We have no custom __dealloc__ or __del__
# Exception is the builtin python Exception
# inside the exceptions.pxd we have this def for Exception
cdef extern from "Python.h":
    ctypedef extern class builtins.Exception[object PyBaseExceptionObject]:
        pass


# inside the exceptions.pyx
cdef class Error(Exception):
   # Has no slots
    ...

cdef class GeneratedError(Error):
  # has some attribute slots
   ...

Expected behaviour

no crash

OS

Linux

Python version

3.10.9

Cython version

3.0.8

Additional context

No response