Update eventing nightly (#1480)

bumping knative.dev/eventing eff8465...6aa49dc:
  > 6aa49dc [main] Update community files (# 8256)
  > 33a9027 feat: make oidc discovery url configurable (# 8145)

Signed-off-by: Knative Automation <[email protected]>

Author: knative-automation