Issue #18408: Oh, I was wrong: Pickler_New() must call Py_DECREF() to destroy

the newly created pickler, and not PyObject_GC_Del().

Modules/_pickle.c

@@ -782,7 +782,7 @@ _Pickler_New(void)
                                                     self->max_output_len);
 
     if (self->memo == NULL || self->output_buffer == NULL) {
-        PyObject_GC_Del(self);
+        Py_DECREF(self);
         return NULL;
     }
     return self;