GROOVY-9624: Bump Codenarc to 1.6
GROOVY-9624: Bump Codenarc to 1.6

paulk-asert/groovy,paulk-asert/incubator-groovy,paulk-asert/groovy,apache/incubator-groovy,paulk-asert/incubator-groovy,apache/groovy,paulk-asert/groovy,apache/groovy,paulk-asert/incubator-groovy,apache/incubator-groovy,apache/incubator-groovy,paulk-asert/incubator-groovy,paulk-asert/groovy,paulk-asert/incubator-groovy,apache/groovy,apache/groovy,apache/incubator-groovy