HSPC-177: updated gradle version to 8.5 and java to 21 #237

Job	Run time
Build epicbox-haskell image	4m 56s
Build epicbox-go image	2m 2s
Build epicbox-clojure image	30s
Build epicbox/debian image	41s
Build epicbox-hyperskill/go image	2m 35s
Build epicbox-hyperskill/gradle image	1m 57s
Build epicbox-hyperskill/java image	54s
Build epicbox-hyperskill/gradle-spring image	1m 21s
Build epicbox-hyperskill/node image	13m 0s
Build epicbox-hyperskill/node-javascript image	1m 15s
Build epicbox-hyperskill/python image	1m 0s
Build epicbox/hyperstyle image	2m 14s
Build epicbox/java image	40s
Build epicbox/kotlin image	57s
Build epicbox/node image	39s
Build epicbox/php image	25s
Build epicbox/pmd image	33s
Build epicbox/python 3.10 image	5m 37s
Build epicbox/python 3.11 image	5m 40s
Build epicbox/ruby image	1m 54s
Build epicbox/scala3 image	42s
Build epicbox/scala2 image	39s
Build epicbox/typescript image	38s
Build epicbox-gcc image	56s
Build epicbox-hyperskill/gcc image	2m 26s
Build epicbox/mono image	1m 17s
Clean untagged images	0s
	55m 28s

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