chore: remove deprecated "io/ioutil" imports (#25119)

Co-authored-by: Ben Schumacher <ben.schumacher@mattermost.com>

tools/mmgotool/commands/i18n.go

@@ -11,7 +11,6 @@ import (
 	"go/ast"
 	"go/parser"
 	"go/token"
-	"io/ioutil"
 	"log"
 	"os"
 	"path"
@@ -109,7 +108,7 @@ func init() {
 }
 
 func getBaseFileSrcStrings(mattermostDir string) ([]Translation, error) {
-	jsonFile, err := ioutil.ReadFile(path.Join(mattermostDir, "i18n", "en.json"))
+	jsonFile, err := os.ReadFile(path.Join(mattermostDir, "i18n", "en.json"))
 	if err != nil {
 		return nil, err
 	}
@@ -495,7 +494,7 @@ func extractFromPath(path string, info os.FileInfo, err error, i18nStrings map[s
 		return nil
 	}
 
-	src, err := ioutil.ReadFile(path)
+	src, err := os.ReadFile(path)
 	if err != nil {
 		panic(err)
 	}
@@ -580,7 +579,7 @@ func checkEmptySrcCmdF(command *cobra.Command, args []string) error {
 		}
 		translationDir = portalDir
 	}
-	srcJSON, err := ioutil.ReadFile(path.Join(translationDir, "en.json"))
+	srcJSON, err := os.ReadFile(path.Join(translationDir, "en.json"))
 	if err != nil {
 		return err
 	}
@@ -647,13 +646,13 @@ func cleanEmptyCmdF(command *cobra.Command, args []string) error {
 	}
 
 	var shippedFiles []string
-	files, err := ioutil.ReadDir(translationDir)
+	dirEntries, err := os.ReadDir(translationDir)
 	if err != nil {
 		return err
 	}
-	for _, file := range files {
-		if !file.IsDir() && filepath.Ext(file.Name()) == ".json" && file.Name() != "en.json" {
-			shippedFiles = append(shippedFiles, file.Name())
+	for _, dirEntry := range dirEntries {
+		if !dirEntry.IsDir() && filepath.Ext(dirEntry.Name()) == ".json" && dirEntry.Name() != "en.json" {
+			shippedFiles = append(shippedFiles, dirEntry.Name())
 		}
 	}
 
@@ -676,7 +675,7 @@ func cleanEmptyCmdF(command *cobra.Command, args []string) error {
 }
 
 func clean(translationDir string, file string, dryRun bool, check bool) (*string, error) {
-	oldJSON, err := ioutil.ReadFile(path.Join(translationDir, file))
+	oldJSON, err := os.ReadFile(path.Join(translationDir, file))
 	if err != nil {
 		return nil, err
 	}
@@ -709,7 +708,7 @@ func clean(translationDir string, file string, dryRun bool, check bool) (*string
 	if err != nil {
 		return nil, err
 	}
-	if err = ioutil.WriteFile(filename, newJSON, fileInfo.Mode().Perm()); err != nil {
+	if err = os.WriteFile(filename, newJSON, fileInfo.Mode().Perm()); err != nil {
 		return nil, err
 	}
 	return &result, nil