multi: repleace ioutil.ReadFile

lnd.go

@@ -8,7 +8,6 @@ import (
 	"context"
 	"errors"
 	"fmt"
-	"io/ioutil"
 	"net"
 	"net/http"
 	"net/http/pprof"
@@ -83,7 +82,7 @@ func AdminAuthOptions(cfg *Config, skipMacaroons bool) ([]grpc.DialOption,
 	// Get the admin macaroon if macaroons are active.
 	if !skipMacaroons && !cfg.NoMacaroons {
 		// Load the admin macaroon file.
-		macBytes, err := ioutil.ReadFile(cfg.AdminMacPath)
+		macBytes, err := os.ReadFile(cfg.AdminMacPath)
 		if err != nil {
 			return nil, fmt.Errorf("unable to read macaroon "+
 				"path (check the network setting!): %v", err)