multi: bump btcd to taproot aware version

input/taproot.go

@@ -0,0 +1,20 @@
+package input
+
+import (
+	"github.com/btcsuite/btcd/txscript"
+	"github.com/btcsuite/btcd/wire"
+)
+
+// NewTxSigHashesV0Only returns a new txscript.TxSigHashes instance that will
+// only calculate the sighash midstate values for segwit v0 inputs and can
+// therefore never be used for transactions that want to spend segwit v1
+// (taproot) inputs.
+func NewTxSigHashesV0Only(tx *wire.MsgTx) *txscript.TxSigHashes {
+	// The canned output fetcher returns a wire.TxOut instance with the
+	// given pk script and amount. We can get away with nil since the first
+	// thing the TxSigHashes constructor checks is the length of the pk
+	// script and whether it matches taproot output script length. If the
+	// length doesn't match it assumes v0 inputs only.
+	nilFetcher := txscript.NewCannedPrevOutputFetcher(nil, 0)
+	return txscript.NewTxSigHashes(tx, nilFetcher)
+}