QtQuick sample - restore running with Qt5 (break Qt6)

Author: gkv311

occt-qtquick/main.qml

@@ -1,6 +1,6 @@
 import QtQuick 2.7
 import QtQuick.Controls 2.2
-import QtQuick.Dialogs
+import QtQuick.Dialogs 1.2
 
 import OcctQQuickFramebufferViewer 1.0