Disable Maven snapshots on main #107

Job	Run time
Build scip-java CLI	4m 46s
gradle-kotlin-okio	4m 30s
gradle-java21-readiness	2m 56s
maven-java25-demo	2m 36s
maven-kotlin-json-kotlin-maven	2m 54s
maven-java17-spring-boot	2m 50s
gradle-kotlin-flowext	2m 47s
bazel-java-examples	2m 47s
gradle-mixed-okio-jmh	4m 33s
	30m 39s

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