all: replace uses of ioutil with io and os (#24869)

cmd/utils/flags.go

@@ -21,7 +21,6 @@ import (
 	"crypto/ecdsa"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"math"
 	"math/big"
 	"os"
@@ -1213,7 +1212,7 @@ func MakePasswordList(ctx *cli.Context) []string {
 	if path == "" {
 		return nil
 	}
-	text, err := ioutil.ReadFile(path)
+	text, err := os.ReadFile(path)
 	if err != nil {
 		Fatalf("Failed to read password file: %v", err)
 	}