fix: missing example in psbt segwit example

Author: karliatto

cookbook/src/psbt/multiple_inputs_segwit-v0.md

@@ -37,12 +37,12 @@ use bitcoin::bip32::{ChildNumber, IntoDerivationPath, Fingerprint, Xpriv, Xpub};
 use bitcoin::hashes::Hash;
 use bitcoin::locktime::absolute;
 use bitcoin::psbt::Input;
-use bitcoin::secp256k1::{self, Message, Secp256k1, Signing};
+use bitcoin::secp256k1::{Secp256k1, Signing};
 use bitcoin::consensus;
-use bitcoin::transaction::{self, OutPoint, TxIn, TxOut};
+use bitcoin::transaction::{self, OutPoint, TxIn, TxOut, Transaction};
 use bitcoin::{
     Address, Amount, EcdsaSighashType, Network, Psbt, ScriptBuf, Sequence,
-    Txid, WPubkeyHash, Witness, XOnlyPublicKey,
+    Txid, WPubkeyHash, Witness,
 };
 ```