zoom-us: 2.3.128305.0716 -> 2.4.129780.0915, QT downgrade (#46778)

Qt 5.11 was downgraded to 5.9 because of two issues:
- spawns errors like
```
qrc:/qml/SignInWaiting.qml:20:9: QML BusyIndicator: Detected anchors on an item that is managed by a layout. This is undefined behavior; use Layout.alignment instead.
qrc:/qml/SignInWaiting.qml:26:9: QML Text: Detected anchors on an item that is managed by a layout. This is undefined behavior; use Layout.alignment instead.
qrc:/qml/SignInWaiting.qml:20:9: QML BusyIndicator: Detected anchors on an item that is managed by a layout. This is undefined behavior; use Layout.alignment instead.
qrc:/qml/SignInWaiting.qml:26:9: QML Text: Detected anchors on an item that is managed by a layout. This is undefined behavior; use Layout.alignment instead.
qrc:/qml/SignInWaiting.qml:20:9: QML BusyIndicator: Detected anchors on an item that is managed by a layout. This is undefined behavior; use Layout.alignment instead.
qrc:/qml/SignInWaiting.qml:26:9: QML Text: Detected anchors on an item that is managed by a layout. This is undefined behavior; use Layout.alignment instead.
qrc:/qml/SignInWaiting.qml:20:9: QML BusyIndicator: Detected anchors on an item that is managed by a layout. This is undefined behavior; use Layout.alignment instead.
qrc:/qml/SignInWaiting.qml:26:9: QML Text: Detected anchors on an item that is managed by a layout. This is undefined behavior; use Layout.alignment instead.
qrc:/qml/SignInWaiting.qml:20:9: QML BusyIndicator: Detected anchors on an item that is managed by a layout. This is undefined behavior; use Layout.alignment instead.
qrc:/qml/SignInWaiting.qml:26:9: QML Text: Detected anchors on an item that is managed by a layout. This is undefined behavior; use Layout.alignment instead.
```
- Google login doesn't work. It just doesn't start embedded webbrowser