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Update CI to support java 21 #383

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Job	Run time
Java 11 tests	29s
Java 19 tests	32s
Java 17 tests	31s
Java 16 tests	30s
Java 20 tests	36s
Java 18 tests	30s
Java 21 tests	27s
Java 8 tests	34s
Build (matrix)	4s
	4m 13s