[PRISMA] [PIP-009] Increase Max Debt for sfrxETH to $50m

Quorum: 10% veCLEV

As the max debt from sfrxETH has reached the 33m mkUSD limit, we propose to increase the max debt for this collateral to 50M.

Read more: https://gov.prismafinance.com/t/pip-009-increase-max-debt-for-sfrxeth-to-50m/75