Change MySQL docker image used in Java Integration test from latest t… #533

Job	Run time
build-kafka-lightweight / build	5m 7s
testflows-kafka / testflows-kafka	29m 9s
java-tests-lightweight / java-lightweight	1h 24m 21s
java-tests-kafka / java-kafka	1m 47s
testflows-lightweight / testflows-lightweight	57m 33s
testflows-lightweight / testflows-lightweight-replicated	1h 1m 50s
	3h 59m 47s

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