Fix warning in ensure_shared_on_resize

Author: sergey-miryanov

Objects/listobject.c

@@ -79,7 +79,8 @@ ensure_shared_on_resize(PyListObject *self)
     // We can't use _Py_CRITICAL_SECTION_ASSERT_OBJECT_LOCKED here because
     // the `CALL_LIST_APPEND` bytecode handler may lock the list without
     // a critical section.
-    assert(_PyObject_IsUniquelyReferenced(self) || PyMutex_IsLocked(&_PyObject_CAST(self)->ob_mutex));
+    assert(_PyObject_IsUniquelyReferenced((PyObject *)self) ||
+           PyMutex_IsLocked(&_PyObject_CAST(self)->ob_mutex));
 
     // Ensure that the list array is freed using QSBR if we are not the
     // owning thread.