switch to non jdk8 stdlib #935

Job	Run time
build-matrix	7s
ngx-default	17m 45s
ngx-default-additional	10m 55s
ngx-mongodb-kafka-cucumber	14m 19s
ngx-gradle-fr	14m 59s
ngx-gradle-h2disk-ws-nocache	15m 43s
ngx-webflux-mongodb	12m 51s
ngx-webflux-gradle-mongodb-oauth2	15m 40s
ngx-webflux-psql-default	13m 35s
ngx-webflux-psql-additional	7m 47s
ngx-webflux-gradle-session-h2mem-es	11m 11s
mf-ngx-eureka-jwt-psql-ehcache	22m 36s
check-angular	1s
	2h 37m 29s

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