Migrate build to Gradle 9 #27

Job	Run time
Build scip-java CLI	4m 38s
maven-kotlin-json-kotlin-maven	2m 38s
maven-java17-spring-boot	2m 37s
gradle-mixed-okio-jmh	4m 25s
bazel-java-examples	2m 33s
gradle-java21-readiness	2m 50s
gradle-kotlin-okio	4m 21s
gradle-kotlin-flowext	3m 37s
	27m 39s

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