Bump org.apache.maven.plugins:maven-gpg-plugin from 3.0.1 to 3.1.0 #4420

Job	Run time
build-all	1m 45s
tests (es, -Pelasticsearch8, es8, 8)	27m 59s
tests (es, -Pelasticsearch7, es7, 8)	27m 26s
tests (es, -Pelasticsearch6, es6, 8)	26m 26s
tests (es, -Pelasticsearch60, es60, 8)	26m 20s
tests (es, -Pjava-11, -Pelasticsearch8, es8, 11)	28m 5s
tests (es, -Pjava-11, -Pelasticsearch7, es7, 11)	27m 10s
tests (es, -Pjava-11, -Pelasticsearch6, es6, 11)	26m 23s
tests (es, -Pjava-11, -Pelasticsearch60, es60, 11)	26m 28s
	3h 38m 2s

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