GROOVY-9444: update versions plugin to 0.28.0
GROOVY-9444: update versions plugin to 0.28.0

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