[BugFix] Updated some Cython code to adapt to Cython 3.0.0 version. (#6052)

Co-authored-by: Ubuntu <ubuntu@ip-172-31-21-37.ap-northeast-1.compute.internal>

python/dgl/_ffi/_cython/ndarray.pxi

 from ..runtime_ctypes import DGLArrayHandle as PyDGLArrayHandle
+from cpython cimport PyCapsule_Destructor
 
 cdef const char* _c_str_dltensor = "dltensor"
 cdef const char* _c_str_used_dltensor = "used_dltensor"
 
 
-cdef void _c_dlpack_deleter(object pycaps):
+cdef _c_dlpack_deleter(object pycaps):
     cdef DLManagedTensor* dltensor
     if pycapsule.PyCapsule_IsValid(pycaps, _c_str_dltensor):
         dltensor = <DLManagedTensor*>pycapsule.PyCapsule_GetPointer(pycaps, _c_str_dltensor)
@@ -77,7 +78,7 @@ cdef class NDArrayBase:
         if self.c_is_view != 0:
             raise ValueError("to_dlpack do not work with memory views")
         CALL(DGLArrayToDLPack(self.chandle, &dltensor, alignment))
-        return pycapsule.PyCapsule_New(dltensor, _c_str_dltensor, _c_dlpack_deleter)
+        return pycapsule.PyCapsule_New(dltensor, _c_str_dltensor, <PyCapsule_Destructor>_c_dlpack_deleter)
 
 
 cdef c_make_array(void* chandle, is_view):