multi: repleace ioutil.ReadAll

channeldb/migration/lnwire21/channel_update.go

@@ -4,7 +4,6 @@ import (
 	"bytes"
 	"fmt"
 	"io"
-	"io/ioutil"
 
 	"github.com/btcsuite/btcd/chaincfg/chainhash"
 )
@@ -160,7 +159,7 @@ func (a *ChannelUpdate) Decode(r io.Reader, pver uint32) error {
 	// we'll collect the remainder into the ExtraOpaqueData field. If there
 	// aren't any bytes, then we'll snip off the slice to avoid carrying
 	// around excess capacity.
-	a.ExtraOpaqueData, err = ioutil.ReadAll(r)
+	a.ExtraOpaqueData, err = io.ReadAll(r)
 	if err != nil {
 		return err
 	}