Update net-kourier nightly (#11580)
Update net-kourier nightly (#11580)

bumping knative.dev/net-kourier a42e8b3...0296006:
  > 0296006 upgrade to latest dependencies (# 557)

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