Bump netty4.version from 4.1.96.Final to 4.1.97.Final #3769

Job	Run time
build-all	1m 25s
tests (es, -Pelasticsearch8, es8, 8)	30m 16s
tests (es, -Pelasticsearch7, es7, 8)	29m 52s
tests (es, -Pelasticsearch6, es6, 8)	30m 42s
tests (es, -Pelasticsearch60, es60, 8)	28m 20s
tests (es, -Pjava-11, -Pelasticsearch8, es8, 11)	32m 38s
tests (es, -Pjava-11, -Pelasticsearch7, es7, 11)	31m 22s
tests (es, -Pjava-11, -Pelasticsearch6, es6, 11)	30m 39s
tests (es, -Pjava-11, -Pelasticsearch60, es60, 11)	30m 3s
	4h 5m 17s

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