Update eventing nightly

bumping knative.dev/eventing 2bd6d6a...bfd6957:
  > bfd6957 Make ApiServerSource SkipPermissions exit always and restart the pod (# 8736)
  > 7304297 test: add test to check that image/container override on IntegrationSource is not allowed (# 8616)

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

Author: knative-automation