Update net-kourier nightly (#13236)
Update net-kourier nightly (#13236)

bumping knative.dev/net-kourier 2491af6...4dfdd8a:
  > 4dfdd8a upgrade to latest dependencies (# 899)

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

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