test: Remove spurious missing references

[gemmahou]

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[acpana]

Hm I think what we wanted here would be for future fields to say:

spec.defaultAdmissionRule.requireAttestationsByRef (see the Ref) at the end!

Arguably a better line in this exceptions file should be

[refs] crd=binaryauthorizationpolicies.binaryauthorization.cnrm.cloud.google.com version=v1beta1: field ".spec.defaultAdmissionRule.requireAttestationsBy[] should be a reference