gh-141510: Update specialzier to support frozendict with BINARY_SUBSCR

Author: corona10

Include/internal/pycore_dict.h

@@ -148,6 +148,8 @@ extern int _PyDict_GetItemRef_KnownHash(PyDictObject *op, PyObject *key, Py_hash
 extern int _PyDict_GetItemRef_Unicode_LockHeld(PyDictObject *op, PyObject *key, PyObject **result);
 PyAPI_FUNC(int) _PyObjectDict_SetItem(PyTypeObject *tp, PyObject *obj, PyObject **dictptr, PyObject *name, PyObject *value);
 
+PyAPI_FUNC(int) _PyFrozenDict_GetItemRef(PyObject *op, PyObject *key, PyObject **result);
+
 extern int _PyDict_Pop_KnownHash(
     PyDictObject *dict,
     PyObject *key,