Bump actions/checkout from 3 to 4 #598

Job	Run time
Linux musl (Q8/Q16/Q16-HDRI, x64)	6m 28s
Linux (Q8/Q16/Q16-HDRI, arm64)	1h 12m 27s
Linux (Q8/Q16/Q16-HDRI, x64)	6m 41s
Library (Core)	7m 35s
MacOS (Q8/Q16/Q16-HDRI)	4m 19s
Library (SystemDrawing)	8m 49s
Library (SystemWindowsMedia)	7m 38s
Windows (Q8, x86)	5m 49s
Windows (Q8, x64)	5m 54s
Windows (Q8, arm64)	5m 44s
Windows (Q8, Any CPU)	6m 0s
Windows (Q8-OpenMP, x64)	5m 55s
Windows (Q8-OpenMP, arm64)	5m 56s
Windows (Q16, x86)	5m 49s
Windows (Q16, x64)	5m 54s
Windows (Q16, arm64)	5m 50s
Windows (Q16, Any CPU)	5m 50s
Windows (Q16-OpenMP, x64)	5m 50s
Windows (Q16-OpenMP, arm64)	5m 50s
Windows (Q16-HDRI, x86)	5m 49s
Windows (Q16-HDRI, x64)	5m 56s
Windows (Q16-HDRI, arm64)	5m 53s
Windows (Q16-HDRI, Any CPU)	5m 49s
Windows (Q16-HDRI-OpenMP, x64)	5m 48s
Windows (Q16-HDRI-OpenMP, arm64)	5m 50s
	3h 39m 23s

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