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/private/restore_repo.go

@@ -7,7 +7,7 @@ package private
 import (
 	"context"
 	"fmt"
-	"io/ioutil"
+	"io"
 	"net/http"
 	"time"
 
@@ -47,7 +47,7 @@ func RestoreRepo(ctx context.Context, repoDir, ownerName, repoName string, units
 		var ret = struct {
 			Err string `json:"err"`
 		}{}
-		body, err := ioutil.ReadAll(resp.Body)
+		body, err := io.ReadAll(resp.Body)
 		if err != nil {
 			return http.StatusInternalServerError, fmt.Sprintf("Response body error: %v", err.Error())
 		}