HSPC-177: updated gradle version to 8.5 and java to 21 (#138) #242

Job	Run time
Build epicbox-go image	2m 54s
Build epicbox-haskell image	13m 56s
Build epicbox-clojure image	40s
Build epicbox/debian image	2m 48s
Build epicbox-hyperskill/go image	2m 23s
Build epicbox-hyperskill/gradle image	2m 52s
Build epicbox-hyperskill/gradle-spring image	1m 28s
Build epicbox-hyperskill/java image	55s
Build epicbox-hyperskill/node image	13m 18s
Build epicbox-hyperskill/node-javascript image	1m 30s
Build epicbox-hyperskill/python image	55s
Build epicbox/hyperstyle image	3m 30s
Build epicbox/java image	49s
Build epicbox/kotlin image	52s
Build epicbox/node image	28s
Build epicbox/php image	35s
Build epicbox/pmd image	45s
Build epicbox/python 3.10 image	6m 2s
Build epicbox/python 3.11 image	6m 3s
Build epicbox/ruby image	2m 10s
Build epicbox/scala2 image	48s
Build epicbox/typescript image	45s
Build epicbox/scala3 image	52s
Build epicbox-gcc image	1m 4s
Build epicbox-hyperskill/gcc image	2m 33s
Build epicbox/mono image	1m 25s
Clean untagged images	56s
	1h 13m 16s

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