Migrate build to Gradle 9 #25

Job	Run time
Build scip-java CLI	4m 29s
gradle-mixed-okio-jmh	3m 16s
bazel-java-examples	2m 53s
gradle-java21-readiness	1m 37s
maven-kotlin-json-kotlin-maven	2m 57s
gradle-kotlin-flowext	3m 44s
maven-java17-spring-boot	2m 45s
gradle-kotlin-okio	4m 29s
	26m 10s

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