[3.12] gh-126991: Fix reference leak in loading pickle's opcode BUILD (GH-126990) (GH-127019)

If PyObject_SetItem() fails in the `load_build()` function of _pickle.c, no DECREF for the `dict` variable.
(cherry picked from commit 29cbcbd)

Co-authored-by: Justin Applegate <[email protected]>

Author: miss-islington

Modules/_pickle.c

@@ -6726,6 +6726,7 @@ load_build(PickleState *st, UnpicklerObject *self)
             }
             if (PyObject_SetItem(dict, d_key, d_value) < 0) {
                 Py_DECREF(d_key);
+                Py_DECREF(dict);
                 goto error;
             }
             Py_DECREF(d_key);