Make trivy scan tentative to overcome rate limits #5390

Job	Run time
build-all	3m 2s
tests (es, -Pelasticsearch8, es8-java8, 8)	31m 7s
tests (es, -Pelasticsearch7, es7-java8, 8)	29m 56s
tests (es, -Pelasticsearch6, es6-java8, 8)	29m 17s
tests (es, -Pelasticsearch60, es60-java8, 8)	29m 0s
tests (es, -Pjava-11, -Pelasticsearch8, es8, 11)	30m 53s
tests (es, -Pjava-11, -Pelasticsearch7, es7, 11)	30m 0s
tests (es, -Pjava-11, -Pelasticsearch6, es6, 11)	29m 14s
tests (es, -Pjava-11, -Pelasticsearch60, es60, 11)	29m 11s
	4h 1m 40s

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