Migrate to Bazel 9 (#937) #40

Job	Run time
Build scip-java CLI	4m 31s
gradle-kotlin-flowext	3m 47s
gradle-mixed-okio-jmh	3m 34s
gradle-kotlin-okio	4m 26s
gradle-java21-readiness	1m 40s
bazel-java-examples	2m 30s
maven-java17-spring-boot	1m 41s
maven-kotlin-json-kotlin-maven	1m 29s
	23m 38s

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