Fix serializing objects with custom child types using DataObject/Clipboard · picoe/Eto@4d6a4da

The following actions uses node12 which is deprecated and will be forced to run on node16: actions/checkout@v2, actions/upload-artifact@v2. For more info: https://github.blog/changelog/2023-06-13-github-actions-all-actions-will-run-on-node16-instead-of-node12-by-default/

'Display.DeviceManager' is obsolete

'DeviceManager.ClientPointer' is obsolete

'Device.Grab(Window, GrabOwnership, bool, EventMask, Cursor, uint)' is obsolete

'Display.DeviceManager' is obsolete

'DeviceManager.ClientPointer' is obsolete

'Device.Ungrab(uint)' is obsolete

'Threads.Enter()' is obsolete

'StyleContext.GetFont(StateFlags)' is obsolete

'Widget.OverrideFont(FontDescription)' is obsolete

'StyleContext.GetBackgroundColor(StateFlags)' is obsolete

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