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

core/config/yaml/yaml.go

@@ -26,7 +26,6 @@ package yaml
 import (
 	"errors"
 	"fmt"
-	"io/ioutil"
 	"os"
 	"strings"
 	"sync"
@@ -66,7 +65,7 @@ func (*Config) ParseData(data []byte) (config.Configer, error) {
 
 // ReadYmlReader Read yaml file to map.
 func ReadYmlReader(path string) (cnf map[string]interface{}, err error) {
-	buf, err := ioutil.ReadFile(path)
+	buf, err := os.ReadFile(path)
 	if err != nil {
 		return
 	}