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Update dependency com.diffplug.spotless to v8.9.0 (#985) #178

Job	Run time
Build scip-java CLI	4m 37s
maven-java17-spring-boot	2m 56s
gradle-kotlin-kotlinpoet	8m 1s
bazel-java-examples	1m 38s
maven-kotlin-json-kotlin-maven	2m 56s
gradle-kotlin-kotlinconf-app	4m 8s
gradle-java21-readiness	1m 37s
maven-java25-demo	2m 37s
gradle-mixed-kotlinpoet	9m 14s
Repository indexing pass	4s
	37m 48s