HSPC-177: updated gradle version to 8.5 and java to 21 #236

Job	Run time
Build epicbox/debian image	43s
Build epicbox-go image	2m 2s
Build epicbox-clojure image	30s
Build epicbox-haskell image	3m 50s
Build epicbox-hyperskill/go image	2m 33s
Build epicbox-hyperskill/gradle image	1m 55s
Build epicbox-hyperskill/gradle-spring image	1m 23s
Build epicbox-hyperskill/java image	57s
Build epicbox-hyperskill/node image	3m 51s
Build epicbox-hyperskill/node-javascript image	1m 33s
Build epicbox-hyperskill/python image	48s
Build epicbox/hyperstyle image	2m 22s
Build epicbox/java image	37s
Build epicbox/kotlin image	1m 0s
Build epicbox/node image	28s
Build epicbox/php image	27s
Build epicbox/pmd image	36s
Build epicbox/python 3.10 image	2m 34s
Build epicbox/python 3.11 image	2m 28s
Build epicbox/ruby image	1m 57s
Build epicbox/scala2 image	40s
Build epicbox/typescript image	38s
Build epicbox/scala3 image	45s
Build epicbox-gcc image	55s
Build epicbox/mono image	1m 24s
Build epicbox-hyperskill/gcc image	1m 28s
Clean untagged images	1s
	38m 25s

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