bpo-47250: Fix refleak from object.__getstate__() (GH-32403)

Co-authored-by: Brandt Bucher <brandt@python.org>

Objects/typeobject.c

@@ -5030,7 +5030,6 @@ object_getstate_default(PyObject *obj, int required)
 
             name = PyList_GET_ITEM(slotnames, i);
             Py_INCREF(name);
-            value = PyObject_GetAttr(obj, name);
             if (_PyObject_LookupAttr(obj, name, &value) < 0) {
                 Py_DECREF(name);
                 goto error;