[Automated] Update backstage-plugins-eventing nightly

[knative-automation]

/assign @knative-extensions/backstage-plugins-writers
/cc @knative-extensions/backstage-plugins-writers

Produced via:

for x in eventing-crds.yaml eventing-core.yaml in-memory-channel.yaml mt-channel-broker.yaml; do
  curl https://storage.googleapis.com/knative-nightly/eventing/latest/$x > ${GITHUB_WORKSPACE}/./third_party/eventing-latest/$x
done

Details:

bumping knative.dev/eventing 67af70b...aa6f73b:
  > aa6f73b [main] Upgrade to latest dependencies (# 8236)
  > db729bc [main] Update community files (# 8237)

[knative-prow]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: knative-automation
Once this PR has been reviewed and has the lgtm label, please assign davidhadas for approval. For more information see the Kubernetes Code Review Process.

The full list of commands accepted by this bot can be found here.

Needs approval from an approver in each of these files:

• OWNERS

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment