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>

modules/storage/local.go

@@ -7,7 +7,6 @@ package storage
 import (
 	"context"
 	"io"
-	"io/ioutil"
 	"net/url"
 	"os"
 	"path/filepath"
@@ -76,7 +75,7 @@ func (l *LocalStorage) Save(path string, r io.Reader, size int64) (int64, error)
 	if err := os.MkdirAll(l.tmpdir, os.ModePerm); err != nil {
 		return 0, err
 	}
-	tmp, err := ioutil.TempFile(l.tmpdir, "upload-*")
+	tmp, err := os.CreateTemp(l.tmpdir, "upload-*")
 	if err != nil {
 		return 0, err
 	}