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e69d93949c
In this commit, we introduce the ability to bump the fee of an input within the UtxoSweeper. Once its fee rate is bumped, a replacement transaction (RBF) will be broadcast with the newer fee rate (assuming the newer fee rate is high enough to be valid), replacing any conflicting lower fee rate transactions. Note that this currently doesn't validate the fee preference of the bump. This responsibility is delegated to the caller, so care must be taken to ensure the new fee preference is sufficient.