Update to new etcd-manager image

[rifelpet]

/kind blocks-next

This is a reminder to update the etcd-manager image back to a tagged release. We're currently using a staging image from #16722

[k8s-ci-robot]

@rifelpet: The label(s) kind/blocks-next cannot be applied, because the repository doesn't have them.

In response to this:

/kind blocks-next

This is a reminder to update the etcd-manager image back to a tagged release. We're currently using a staging image from #16722

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