[Automated] Update backstage-plugins-eventing nightly (#158)

Update eventing nightly

bumping knative.dev/eventing d243b91...5fb693f:
  > 5fb693f [main] Upgrade to latest dependencies (# 8431)
  > 73357a6 Add `sinks.knative.dev` to namespaced ClusterRole (# 8432)

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

Author: knative-automation