Revert "bump silk"
Revert "bump silk"

This reverts commit 27a511f7e8456769a2ea69858182267ba642f483.

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