Bump org.apache.maven.plugins:maven-assembly-plugin from 3.5.0 to 3.7.0 #227

Job	Run time
build-all	1m 15s
tests (es, -Pelasticsearch8, es8, 8)	27m 42s
tests (es, -Pelasticsearch7, es7, 8)	27m 16s
tests (es, -Pelasticsearch6, es6, 8)	26m 27s
tests (es, -Pelasticsearch60, es60, 8)	26m 16s
tests (es, -Pjava-11, -Pelasticsearch8, es8, 11)	27m 51s
tests (es, -Pjava-11, -Pelasticsearch7, es7, 11)	27m 10s
tests (es, -Pjava-11, -Pelasticsearch6, es6, 11)	26m 40s
tests (es, -Pjava-11, -Pelasticsearch60, es60, 11)	26m 10s
	3h 36m 47s

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