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Update Gradle to v9.8.1 #301

Job	Run time
Build scip-java CLI	4m 47s
maven-java17-spring-boot	2m 20s
gradle-java21-readiness	1m 46s
maven-kotlin-json-kotlin-maven	2m 16s
bazel-java-examples	1m 36s
gradle-kotlin-kotlinpoet	2m 57s
gradle-mixed-kotlinpoet	3m 33s
gradle-kotlin-kotlinconf-app	5m 36s
maven-java25-demo	2m 39s
Repository indexing pass	3s
	27m 33s