QNetworkInformation doesn't update state on MacOS

`QNetworkInformation` doesn't update it's properties after initialisation on MacOS. It provides valid statuses until network state doesn't change since backend has been loaded. If you load the backend, then disconnect from network - it will still report reachability as connected. It's happening for reachability and transport medium. Most probably for rest of properties as well. Works fine on Windows.

Code to reproduce:

1. Initialise backend by feature beforehand.

QNetworkInformation::loadBackendByFeatures(QNetworkInformation::Feature::Reachability);

2. Get reachability state.

const auto* info = QNetworkInformation::instance();
if (info && info->supports(QNetworkInformation::Feature::Reachability))
{        
    const auto status = info->reachability();
    // status is valid for the initial state when backend has been created. Any further change in network availability is not propagated to QNetworkInformation
}