[Automated] Update backstage-plugins-eventing nightly (#118)

Update eventing nightly

bumping knative.dev/eventing 3f2b75b...f53d038:
  > f53d038 [main] Update community files (# 8307)
  > df34028 Add missing copyright boilerplate (# 8305)

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

Author: knative-automation