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Upgrade log4j to 2.21.1 . Use log4j-bom #215

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Run time

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Job	Run time
checkstyle	56s
archetypes (ubuntu-20.04)	9m 6s
build (ubuntu-20.04)	46m 44s
copyright	30s
docs	1m 4s
examples (ubuntu-20.04)	14m 29s
packaging (ubuntu-20.04)	24m 49s
spotbugs	23m 43s
examples (macos-latest)	20m 32s
packaging (macos-latest)	21m 5s
tck (ubuntu-20.04)	31m 22s
	3h 14m 20s