Update net-kourier nightly (#11169)
Update net-kourier nightly (#11169)

bumping knative.dev/net-kourier 9560805...db5f869:
  > db5f869 upgrade to latest dependencies (# 491)
  > 7b8e200 upgrade to latest dependencies (# 490)

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