Update net-istio nightly (#13067)
Update net-istio nightly (#13067)

bumping knative.dev/net-istio fc8c03d...e8495d4:
  > e8495d4 Update actions (# 948)

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