istio-cni image hub reverted to dsop.io domain

This commit updated istio (including istio-cni) to 1.8, but also reverted the istio-cni image hub to dsop.io: https://repo1.dso.mil/platform-one/big-bang/apps/core/istio-controlplane/-/commit/a29d2ead2c23fe2bc6bf9a3546efb44942fe37c2