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Upgrade checkout github action to v4 #120

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Job	Run time
copyright	3m 14s
checkstyle	3m 37s
build (ubuntu-20.04)	10m 55s
archetypes (ubuntu-20.04)	10m 52s
docs	3m 37s
examples (ubuntu-20.04)	10m 56s
packaging (ubuntu-20.04)	10m 50s
spotbugs	10m 53s
examples (macos-latest)	10m 52s
packaging (macos-latest)	10m 49s
tck (ubuntu-20.04)	10m 57s
	1h 37m 32s