message: Removed get_output_as_single_output_node method
diff: @@ -2225,7 +2225,9 @@ struct Net::Impl : public detail::NetImplBase
  auto ieInpNode = inputNodes[i].dynamicCast<InfEngineNgraphNode>();
  CV_Assert(oid < ieInpNode->node->get_output_size());
  -#if INF_ENGINE_VER_MAJOR_GT(INF_ENGINE_RELEASE_2020_3)
  +#if INF_ENGINE_VER_MAJOR_GT(INF_ENGINE_RELEASE_2020_4)
  + inputNodes[i] = Ptr<BackendNode>(new InfEngineNgraphNode(ieInpNode->node));
  +#elif INF_ENGINE_VER_MAJOR_GT(INF_ENGINE_RELEASE_2020_3)
  inputNodes[i] = Ptr<BackendNode>(new InfEngineNgraphNode(ieInpNode->node->get_output_as_single_output_node(oid)));
  #else
  inputNodes[i] = Ptr<BackendNode>(new InfEngineNgraphNode(ieInpNode->node->get_output_as_single_output_node(oid, false)));
  