Update net-kourier nightly (#12976)
Update net-kourier nightly (#12976)

bumping knative.dev/net-kourier a72117a...6ccdde7:
  > 6ccdde7 upgrade to latest dependencies (# 849)

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