gh-93728: fix memory leak in deepfrozen code objects (GH-93729)

Objects/codeobject.c

@@ -2092,6 +2092,7 @@ _PyStaticCode_Dealloc(PyCodeObject *co)
     deopt_code(_PyCode_CODE(co), Py_SIZE(co));
     co->co_warmup = QUICKENING_INITIAL_WARMUP_VALUE;
     PyMem_Free(co->co_extra);
+    Py_CLEAR(co->_co_code);
     co->co_extra = NULL;
     if (co->co_weakreflist != NULL) {
         PyObject_ClearWeakRefs((PyObject *)co);