ci: rename cf-deployment-pinned -> cf-deployment-stable
ci: rename cf-deployment-pinned -> cf-deployment-stable

* A previous commit recommended that cf-deployment not be pinned to a
version but rather consume the latest from "master" (stable)

Co-authored-by: Mikael Manukyan <28e16665670bfec41e6fa42496ac6b4836d715ae@pivotal.io>

cloudfoundry-incubator/cf-networking-release,cloudfoundry-incubator/cf-networking-release,cloudfoundry-incubator/cf-networking-release,cloudfoundry-incubator/cf-networking-release