bump silk
bump silk

Submodule src/code.cloudfoundry.org/silk 326a1ea..b398df3:
  > Revert "[cni] Use container IP from store for IFB delete"

[#145244693]

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