Update net-istio nightly (#12345)
Update net-istio nightly (#12345)

bumping knative.dev/net-istio 4352c6f...23b2fcb:
  > 23b2fcb Disable enable-virtualservice-status on istio-head test (# 818)
  > 39a3782 upgrade to latest dependencies (# 816)

Signed-off-by: Knative Automation <f415700d4d0ce1c81810fe7553e3eea2bed16231@knative.team>
knative/serving,knative/serving