Handle ioutil deprecations (#53526)

* replace ioutil.ReadFile -> os.ReadFile

* replace ioutil.ReadAll -> io.ReadAll

* replace ioutil.TempFile -> os.CreateTemp

* replace ioutil.NopCloser -> io.NopCloser

* replace ioutil.WriteFile -> os.WriteFile

* replace ioutil.TempDir -> os.MkdirTemp

* replace ioutil.Discard -> io.Discard

pkg/services/export/commit_helper.go

@@ -3,7 +3,6 @@ package export
 import (
 	"context"
 	"fmt"
-	"io/ioutil"
 	"os"
 	"path"
 	"strings"
@@ -108,7 +107,7 @@ func (ch *commitHelper) add(opts commitOptions) error {
 			}
 		}
 
-		err = ioutil.WriteFile(b.fpath, body, 0644)
+		err = os.WriteFile(b.fpath, body, 0644)
 		if err != nil {
 			return err
 		}

pkg/services/export/export_dash_thumbs.go

@@ -3,7 +3,7 @@ package export
 import (
 	"encoding/json"
 	"fmt"
-	"io/ioutil"
+	"os"
 	"path/filepath"
 	"strings"
 	"time"
@@ -13,7 +13,7 @@ import (
 
 func exportDashboardThumbnails(helper *commitHelper, job *gitExportJob) error {
 	alias := make(map[string]string, 100)
-	aliasLookup, err := ioutil.ReadFile(filepath.Join(helper.orgDir, "root-alias.json"))
+	aliasLookup, err := os.ReadFile(filepath.Join(helper.orgDir, "root-alias.json"))
 	if err != nil {
 		return fmt.Errorf("missing dashboard alias files (must export dashboards first)")
 	}