Update net-istio nightly (#11484)
Update net-istio nightly (#11484)

bumping knative.dev/net-istio 00a2c8a...542899c:
  > 542899c Update actions (# 662)

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