Bump gradle from 8.11.1-jdk17 to 8.12.0-jdk17 in /implementations/java-json-schema-validator #823

Job	Run time
list	2s
build (lua-jsonschema)	4s
build (python-jschon)	5s
build (dotnet-jsonschema-net)	7s
build (ts-vscode-json-languageservice)	7s
build (java-openapiprocessor)	8s
build (java-json-schema)	5s
build (js-ajv)	5s
build (java-jsonschemafriend)	5s
build (clojure-json-schema)	11s
build (js-hyperjump)	5s
build (rust-jsonschema)	5s
build (python-fastjsonschema)	7s
build (cpp-valijson)	4s
build (php-opis-json-schema)	4s
build (kotlin-kmp-json-schema-validator)	4s
build (java-json-schema-validator)	34s
build (python-jsonschema)	3s
build (ruby-json_schemer)	7s
build (go-gojsonschema)	5s
build (rust-boon)	5s
build (go-jsonschema)	4s
	2m 26s

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