Update net-kourier nightly (#13009)
Update net-kourier nightly (#13009)

bumping knative.dev/net-kourier fbbfa2d...2d8b30b:
  > 2d8b30b Update community files (# 854)

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