Update net-kourier nightly (#12556)
Update net-kourier nightly (#12556)

bumping knative.dev/net-kourier bea86d6...306979c:
  > 306979c Update community files (# 758)

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