update 07-tm err msg to utc time (#6383)

Co-authored-by: Federico Kunze <31522760+fedekunze@users.noreply.github.com>

x/ibc/07-tendermint/update.go

@@ -75,7 +75,7 @@ func checkValidity(
 		return sdkerrors.Wrapf(
 			clienttypes.ErrInvalidHeader,
 			"header blocktime ≤ latest client state block time (%s ≤ %s)",
-			header.Time.String(), clientState.GetLatestTimestamp().String(),
+			header.Time.UTC(), clientState.GetLatestTimestamp().UTC(),
 		)
 	}