Bump netty4.version from 4.1.115.Final to 4.2.0.Final #5531

Job	Run time
build-all	3m 28s
build-java11	2m 51s
tests (server, 8)	3m 57s
tests (test, 8)	6m 45s
tests (core, 8)	1m 25s
tests (driver, 8)	1m 6s
tests (core, -Pjava-11, 11)	1m 27s
tests (inmemory, -Dtest.skip.tp=false, 8)	32m 17s
tests (lucene, 8)	4m 58s
tests (berkeleyje, 8)	8m 50s
tests (test, -Pjava-11, 11)	6m 54s
tests (server, -Pjava-11, 11)	3m 50s
tests (driver, -Pjava-11, 11)	1m 13s
tests (berkeleyje, -Pjava-11, 11)	9m 1s
tests (lucene, -Pjava-11, 11)	5m 12s
tests (inmemory, -Pjava-11, -Dtest.skip.tp=false, 11)	32m 38s
	2h 5m 52s

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