Fix proxy support with Qt 5.9+

runtime/pgAdmin4.cpp

@@ -241,6 +241,11 @@ int main(int argc, char * argv[])
     {
 #if QT_VERSION >= 0x050000
         QTcpSocket socket;
+
+        #if QT_VERSION >= 0x050900
+        socket.setProxy(QNetworkProxy::NoProxy);
+        #endif
+
         socket.bind(0, QTcpSocket::ShareAddress);
 #else
         QUdpSocket socket;