message: Fix iterator not in same container bug when compile with MSVC2019
diff: @@ -575,7 +575,8 @@ void MavsdkImpl::subscribe_on_new_system(Mavsdk::NewSystemCallback callback)
  _new_system_callback = callback;
  const auto is_any_system_connected = [this]() {
  - return std::any_of(systems().cbegin(), systems().cend(), [](auto& system) {
  + std::vector<std::shared_ptr<System>> connected_systems = systems();
  + return std::any_of(connected_systems.cbegin(), connected_systems.cend(), [](auto& system) {
  return system->is_connected();
  });
  };
  