multi: bump btcd to taproot aware version

lnwallet/chanvalidate/validate.go

@@ -189,6 +189,7 @@ func Validate(ctx *Context) (*wire.OutPoint, error) {
 	vm, err := txscript.NewEngine(
 		ctx.MultiSigPkScript, ctx.CommitCtx.FullySignedCommitTx,
 		0, txscript.StandardVerifyFlags, nil, nil, fundingValue,
+		txscript.NewCannedPrevOutputFetcher(ctx.MultiSigPkScript, 0),
 	)
 	if err != nil {
 		return nil, err

lnwallet/chanvalidate/validate_test.go

@@ -98,7 +98,7 @@ func newChannelTestCtx(chanSize int64) (*channelTestCtx, error) {
 		},
 	}
 
-	sigHashes := txscript.NewTxSigHashes(commitTx)
+	sigHashes := input.NewTxSigHashesV0Only(commitTx)
 	aliceSigRaw, err := txscript.RawTxInWitnessSignature(
 		commitTx, sigHashes, 0, chanSize,
 		multiSigScript, txscript.SigHashAll, alicePriv,