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>

integrations/git_clone_wiki_test.go

@@ -7,8 +7,8 @@ package integrations
 import (
 	"context"
 	"fmt"
-	"io/ioutil"
 	"net/url"
+	"os"
 	"path/filepath"
 	"testing"
 
@@ -24,7 +24,7 @@ func assertFileExist(t *testing.T, p string) {
 }
 
 func assertFileEqual(t *testing.T, p string, content []byte) {
-	bs, err := ioutil.ReadFile(p)
+	bs, err := os.ReadFile(p)
 	assert.NoError(t, err)
 	assert.EqualValues(t, content, bs)
 }
@@ -33,7 +33,7 @@ func TestRepoCloneWiki(t *testing.T) {
 	onGiteaRun(t, func(t *testing.T, u *url.URL) {
 		defer prepareTestEnv(t)()
 
-		dstPath, err := ioutil.TempDir("", "clone_wiki")
+		dstPath, err := os.MkdirTemp("", "clone_wiki")
 		assert.NoError(t, err)
 
 		r := fmt.Sprintf("%suser2/repo1.wiki.git", u.String())