HSPC-177: updated gradle version to 8.5 and java to 21 #234

Job	Run time
Build epicbox-clojure image	35s
Build epicbox/debian image	42s
Build epicbox-go image	2m 11s
Build epicbox-haskell image	5m 10s
Build epicbox-hyperskill/go image	2m 18s
Build epicbox-hyperskill/gradle image	1m 54s
Build epicbox-hyperskill/gradle-spring image	1m 6s
Build epicbox-hyperskill/java image	54s
Build epicbox-hyperskill/node image	13m 9s
Build epicbox-hyperskill/node-javascript image	1m 29s
Build epicbox-hyperskill/python image	57s
Build epicbox/hyperstyle image	54s
Build epicbox/java image	44s
Build epicbox/kotlin image	57s
Build epicbox/node image	35s
Build epicbox/php image	28s
Build epicbox/pmd image	35s
Build epicbox/python 3.10 image	6m 5s
Build epicbox/python 3.11 image	6m 13s
Build epicbox/ruby image	2m 2s
Build epicbox/scala2 image	38s
Build epicbox/scala3 image	46s
Build epicbox/typescript image	40s
Build epicbox/mono image	1m 51s
Build epicbox-hyperskill/gcc image	2m 23s
Build epicbox-gcc image	54s
Clean untagged images	0s
	56m 10s

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