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Mention JDK `17+` requirement in README (#342) #604

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Run time

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Job	Run time
build (3.8.8, 17, ubuntu-latest)	5m 35s
build (3.8.8, 17, windows-latest)	8m 19s
build (3.8.8, 21, ubuntu-latest)	5m 34s
build (3.8.8, 21, windows-latest)	8m 4s
build (3.9.9, 17, ubuntu-latest)	6m 0s
build (3.9.9, 17, windows-latest)	7m 38s
build (3.9.9, 21, ubuntu-latest)	5m 39s
build (3.9.9, 21, windows-latest)	7m 28s
	54m 17s