ClientUpdateProposal is a governance proposal. If it passes, the substitute
client's latest consensus state is copied over to the subject client. The proposal
handler may fail if the subject and the substitute do not match in client and
chain parameters (with exception to latest height, frozen height, and chain-id).
ClientUpdateProposal is a governance proposal. If it passes, the substitute client's latest consensus state is copied over to the subject client. The proposal handler may fail if the subject and the substitute do not match in client and chain parameters (with exception to latest height, frozen height, and chain-id).