message: Fix warnings in Python binding
diff: @@ -108,6 +108,7 @@ void register_class(atom_value*, pybind11::module& m,
  }
  namespace python {
  +namespace {
  class binding {
  public:
  @@ -490,7 +491,7 @@ pybind11::tuple tuple_from_message(const type_erased_tuple& msg) {
  return {};
  }
  auto obj = kvp->second->to_object(msg, i);
  - PyTuple_SET_ITEM(result.ptr(), static_cast<int>(i), obj.release().ptr());
  + PyTuple_SetItem(result.ptr(), static_cast<int>(i), obj.release().ptr());
  }
  return result;
  }
  @@ -573,6 +574,8 @@ CAF_MODULE_INIT_RES caf_module_init() {
  CAF_MODULE_INIT_RET(m.ptr())
  }
  +
  +} // namespace <anonymous>
  } // namespace python
  } // namespace caf
  