[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 f3ea6b5...a40a0a7:
  > a40a0a7 [main] Upgrade to latest dependencies (# 8413)
  > 90edfe6 Upgrade deps to latest (# 8410)
  > 6d71005 Additional unit tests for EventPolicy (# 8405)

[knative-prow]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[knative-prow]

@knative-automation: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
e2e-tests_backstage-plugins_main	18cf91c	link	true	/test e2e-tests

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