Auction house: reduce ability of bidder to make next bidder pay ~40K more gas

[davidbrai]

This should be fixed in the next update to auction house contract:
code-423n4/2022-08-nounsdao-findings#382

Will probably use the mitigation proposed in the C4 issue:

        bool success;
        assembly {
            success := call(30000, addr, amount, 0, 0, 0)
        }