Remove deprecated io/ioutil (#15707)

cmd/update_test.go

@@ -20,7 +20,6 @@ package cmd
 import (
 	"encoding/hex"
 	"fmt"
-	"io/ioutil"
 	"net/http"
 	"net/http/httptest"
 	"net/url"
@@ -233,7 +232,7 @@ func TestIsKubernetes(t *testing.T) {
 // Tests if the environment we are running is Helm chart.
 func TestGetHelmVersion(t *testing.T) {
 	createTempFile := func(content string) string {
-		tmpfile, err := ioutil.TempFile("", "helm-testfile-")
+		tmpfile, err := os.CreateTemp("", "helm-testfile-")
 		if err != nil {
 			t.Fatalf("Unable to create temporary file. %s", err)
 		}