Fix typo: stringifiy=>stringify #1481

Job	Run time
build-matrix	4s
ng-default (n18.18.2/j17)	19m 33s
ng-default-additional (n20/j21)	12m 31s
ng-mysql-es-noi18n-mapsid (n20/j17)	16m 29s
ng-mongodb-kafka-cucumber (n18.18.2/j21)	13m 19s
ng-h2mem-ws-nol2 (n18.18.2/j17)	13m 44s
ng-gradle-fr (n20/j21)	13m 49s
ng-gradle-mariadb-oauth2-infinispan (n20/j17)	15m 10s
ng-gradle-h2disk-ws-nocache (n18.18.2/j21)	14m 52s
ng-webflux-mongodb (n18.18.2/j17)	10m 43s
ng-webflux-gradle-mongodb-oauth2 (n20/j21)	11m 6s
ng-webflux-psql-default (n18.18.2/j17)	12m 34s
ng-webflux-psql-additional (n20/j21)	6m 30s
ng-webflux-gradle-session-h2mem-es (n20/j17)	10m 24s
ms-ng-consul-oauth2-mongodb-caffeine (n18.18.2/j17)	15m 42s
mf-ng-eureka-jwt-psql-ehcache (n20/j21)	20m 4s
ms-mf-ng-consul-oauth2-neo4j (n20/j17)	18m 33s
check-angular	1s
	3h 45m 8s

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