Vertical Pod Autoscaler deps & toolchain updates for 4.16

Shepherd and merge operator automation PR https://github.com/openshift/vertical-pod-autoscaler-operator/pull/151

Update operator like was done in https://github.com/openshift/vertical-pod-autoscaler-operator/pull/146

Shepherd and merge operand automation PR https://github.com/openshift/kubernetes-autoscaler/pull/277

Coordinate with cluster autoscaler team on upstream rebase as in https://github.com/openshift/kubernetes-autoscaler/pull/250