fix: 'VerifiableUpdateLeafNode' was not using the right 'TreeInfoTbs' internally. It does not change anything since this was used only for signature purposes and the TLS serialization of this is untagged

fix: 'VerifiableUpdateLeafNode' was not using the right 'TreeInfoTbs' internally. It does not change anything since this was used only for signature purposes and the TLS serialization of this is untagged #178