SAIP #54.3 - Increase MCR to 90% and decrease Liquidation Fee to 2% for sdeUSD cauldrons

tl;dr This proposal seeks to adjust the parameters of the sdeUSD cauldrons on Abracadabra Money by increasing the Maximum Collateral Ratio (MCR) ratio to 90% and setting the liquidation multiplier to 2%. These changes are motivated by recent developments that have significantly mitigated potential downside risks, including the integration of a special whitelisted role enabling direct sdeUSD redemption into deUSD, and increased sdeUSD-deUSD liquidity that will enhance user experience during leverage operations.