Update wgpu to 0.19, glyphon to 0.5, softbuffer to 0.4, window-clipboard to 0.4, and raw-window-handle to 0.6

Update wgpu to 0.19, glyphon to 0.5, softbuffer to 0.4, window-clipboard to 0.4, and raw-window-handle to 0.6 #4281