set Mantle to stable build 1.4.1 for release
set Mantle to stable build 1.4.1 for release

instructure/CanvasKit,derrh/CanvasKit,instructure/CanvasKit,nlambson/CanvasKit,instructure/CanvasKit,nlambson/CanvasKit,instructure/CanvasKit,derrh/CanvasKit,derrh/CanvasKit,nlambson/CanvasKit,nlambson/CanvasKit,derrh/CanvasKit