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Upgrade checkout github action to v4 #121

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Run time

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Job	Run time
checkstyle	3m 39s
archetypes (ubuntu-20.04)	22m 4s
copyright	3m 15s
build (ubuntu-20.04)	37m 48s
docs	3m 36s
examples (ubuntu-20.04)	11m 1s
packaging (ubuntu-20.04)	18m 42s
spotbugs	20m 37s
examples (macos-latest)	16m 33s
packaging (macos-latest)	35m 31s
tck (ubuntu-20.04)	34m 52s
	3h 27m 38s