Update winit requirement from 0.28.2 to 0.29.4 #65

Job	Run time
Build WebGL Example (ubuntu-latest)	1m 0s
Build [OpenGL \| Linux (x86)]	43s
Build [OpenGL \| Linux (ARM)]	1m 0s
Build [OpenGL \| MacOS (x86)]	1m 55s
Build [OpenGL \| MacOS (ARM)]	1m 46s
Build [OpenGL \| Windows (x86)]	1m 57s
Build [WGPU \| Linux (x86)]	1m 39s
Build [WGPU \| Linux (ARM)]	2m 4s
Build [WGPU \| MacOS (x86)]	3m 19s
Build [WGPU \| MacOS (ARM)]	3m 30s
Build [WGPU \| Windows (x86)]	3m 53s
	22m 46s

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