message: Fix Python return value policy for ``get_symbol()``
  Resolve
diff: @@ -123,7 +123,7 @@ void create<Binary>(py::module& m) {
  static_cast<no_const_func<Symbol&, const std::string&>>(&Binary::get_symbol),
  "Return the " RST_CLASS_REF(lief.Symbol) " with the given ``name``",
  "symbol_name"_a,
  - py::return_value_policy::reference)
  + py::return_value_policy::reference_internal)
  .def("get_function_address",
  &Binary::get_function_address,
  