Bump aquasecurity/trivy-action from 0.19.0 to 0.21.0 #658

Job	Run time
build-all	3m 10s
tests (es, -Pelasticsearch8, es8-java8, 8)	29m 2s
tests (es, -Pelasticsearch7, es7-java8, 8)	28m 36s
tests (es, -Pelasticsearch6, es6-java8, 8)	27m 59s
tests (es, -Pelasticsearch60, es60-java8, 8)	27m 47s
tests (es, -Pjava-11, -Pelasticsearch8, es8, 11)	28m 54s
tests (es, -Pjava-11, -Pelasticsearch7, es7, 11)	28m 14s
tests (es, -Pjava-11, -Pelasticsearch6, es6, 11)	27m 43s
tests (es, -Pjava-11, -Pelasticsearch60, es60, 11)	27m 55s
	3h 49m 20s

Provide feedback