Build on Windows

Bump actions/checkout from 3 to 4 #29

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Run time

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Job	Run time
windows (7.4, x64, nts)	4m 18s
windows (7.4, x64, zts)	4m 37s
windows (7.4, x86, nts)	3m 56s
windows (7.4, x86, zts)	4m 14s
windows (8.0, x64, nts)	4m 43s
windows (8.0, x64, zts)	3m 38s
windows (8.0, x86, nts)	3m 9s
windows (8.0, x86, zts)	4m 3s
windows (8.1, x64, nts)	3m 48s
windows (8.1, x64, zts)	4m 14s
windows (8.1, x86, nts)	4m 36s
windows (8.1, x86, zts)	4m 6s
	49m 22s