Update net-istio nightly (#12309)
Update net-istio nightly (#12309)

bumping knative.dev/net-istio b3cd42a...572f531:
  > 572f531 upgrade to latest dependencies (# 812)
  > 19836d5 upgrade to latest dependencies (# 810)
  > 0264da8 Update community files (# 811)

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