Bump actions/checkout from 3 to 4 #1112

Job	Run time
Check for duplicate workflows	5s
Build (8, windows-latest)	1m 21s
Build (8, ubuntu-latest)	34s
Build (11, windows-latest)	1m 22s
Build (11, ubuntu-latest)	45s
Build (17, windows-latest)	1m 29s
Build (17, ubuntu-latest)	34s
Test (8, windows-latest)	2m 55s
Test (8, ubuntu-latest)	1m 36s
Test (11, windows-latest)	2m 57s
Test (11, ubuntu-latest)	1m 56s
Test (17, windows-latest)	2m 52s
Test (17, ubuntu-latest)	1m 45s
Publish	1m 1s
	21m 12s

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