Update to spinnaker-dependencies 0.42.0
Update to spinnaker-dependencies 0.42.0

Also cleans up spring-boot / spring-framework versions, we had
transitively pulled in a newer boot but were force downgrading
spring, this just officially revs the project up to 1.2.8.RELEASE
of boot and the corresponding 4.1.9.RELEASE of spring

cfieber/gate,spinnaker/gate,cfieber/gate,cfieber/gate,spinnaker/gate,spinnaker/gate