refactor: move from io/ioutil to io and os package (#17109)

The io/ioutil package has been deprecated as of Go 1.16, see
https://golang.org/doc/go1.16#ioutil. This commit replaces the existing
io/ioutil functions with their new definitions in io and os packages.

Signed-off-by: Eng Zer Jun <engzerjun@gmail.com>

Co-authored-by: techknowlogick <techknowlogick@gitea.io>

models/engine_test.go

@@ -5,7 +5,6 @@
 package models
 
 import (
-	"io/ioutil"
 	"os"
 	"path/filepath"
 	"testing"
@@ -19,7 +18,7 @@ import (
 func TestDumpDatabase(t *testing.T) {
 	assert.NoError(t, db.PrepareTestDatabase())
 
-	dir, err := ioutil.TempDir(os.TempDir(), "dump")
+	dir, err := os.MkdirTemp(os.TempDir(), "dump")
 	assert.NoError(t, err)
 
 	type Version struct {