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

internal/jsre/jsre.go

@@ -23,8 +23,8 @@ import (
 	"errors"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"math/rand"
+	"os"
 	"time"
 
 	"github.com/dop251/goja"
@@ -254,7 +254,7 @@ func (re *JSRE) Stop(waitForCallbacks bool) {
 // Exec(file) loads and runs the contents of a file
 // if a relative path is given, the jsre's assetPath is used
 func (re *JSRE) Exec(file string) error {
-	code, err := ioutil.ReadFile(common.AbsolutePath(re.assetPath, file))
+	code, err := os.ReadFile(common.AbsolutePath(re.assetPath, file))
 	if err != nil {
 		return err
 	}
@@ -320,7 +320,7 @@ func (re *JSRE) Compile(filename string, src string) (err error) {
 func (re *JSRE) loadScript(call Call) (goja.Value, error) {
 	file := call.Argument(0).ToString().String()
 	file = common.AbsolutePath(re.assetPath, file)
-	source, err := ioutil.ReadFile(file)
+	source, err := os.ReadFile(file)
 	if err != nil {
 		return nil, fmt.Errorf("Could not read file %s: %v", file, err)
 	}

internal/jsre/jsre_test.go

@@ -17,7 +17,6 @@
 package jsre
 
 import (
-	"io/ioutil"
 	"os"
 	"path"
 	"reflect"
@@ -43,7 +42,7 @@ func (no *testNativeObjectBinding) TestMethod(call goja.FunctionCall) goja.Value
 func newWithTestJS(t *testing.T, testjs string) *JSRE {
 	dir := t.TempDir()
 	if testjs != "" {
-		if err := ioutil.WriteFile(path.Join(dir, "test.js"), []byte(testjs), os.ModePerm); err != nil {
+		if err := os.WriteFile(path.Join(dir, "test.js"), []byte(testjs), os.ModePerm); err != nil {
 			t.Fatal("cannot create test.js:", err)
 		}
 	}