fix: add forgotten crds.additionalAnnotations to crd-cloudeventsources.yaml

[Farfaday]

Add forgotten block to template crds.additionalAnnotations into crd-cloudeventsources.yaml annotations.

Checklist

• [X] I have verified that my change is according to the deprecations & breaking changes policy
• [X] Commits are signed with Developer Certificate of Origin (DCO - learn more)
• [X] README is updated with new configuration values (if applicable) learn more
• [X] A PR is opened to update KEDA core (repo) (if applicable, ie. when deployment manifests are modified)

[JorTurFer]

Thanks!