fix: use of ioutil package (#5261)

* fix ioutil.NopCloser

* fix ioutil.ReadAll

* fix ioutil.ReadFile

* fix ioutil.WriteFile

* run goimports -w -format-only ./

* update CHANGELOG.md

client/cache/file.go

@@ -23,7 +23,6 @@ import (
 	"encoding/json"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"os"
 	"path/filepath"
 	"strconv"
@@ -295,7 +294,7 @@ func exists(path string) (bool, error) {
 // FileGetContents Reads bytes from a file.
 // if non-existent, create this file.
 func FileGetContents(filename string) ([]byte, error) {
-	data, err := ioutil.ReadFile(filename)
+	data, err := os.ReadFile(filename)
 	if err != nil {
 		return nil, berror.Wrapf(err, ReadFileCacheContentFailed,
 			"could not read the data from the file: %s, "+
@@ -307,7 +306,7 @@ func FileGetContents(filename string) ([]byte, error) {
 // FilePutContents puts bytes into a file.
 // if non-existent, create this file.
 func FilePutContents(filename string, content []byte) error {
-	return ioutil.WriteFile(filename, content, os.ModePerm)
+	return os.WriteFile(filename, content, os.ModePerm)
 }
 
 // GobEncode Gob encodes a file cache item.

client/cache/write_delete.go

@@ -18,6 +18,7 @@ import (
 	"context"
 	"errors"
 	"fmt"
+
 	"github.com/beego/beego/v2/core/berror"
 )
 

client/cache/write_delete_test.go

@@ -19,10 +19,11 @@ import (
 	"context"
 	"errors"
 	"fmt"
-	"github.com/stretchr/testify/assert"
 	"testing"
 	"time"
 
+	"github.com/stretchr/testify/assert"
+
 	"github.com/beego/beego/v2/core/berror"
 )