Migrate to use jsoniter instead of encoding/json (#14841)

* Migrate to use jsoniter

* fix tests

* update gitea.com/go-chi/binding

Signed-off-by: Andrew Thornton <art27@cantab.net>
Co-authored-by: 6543 <6543@obermui.de>

integrations/create_no_session_test.go

@@ -5,7 +5,6 @@
 package integrations
 
 import (
-	"encoding/json"
 	"io/ioutil"
 	"net/http"
 	"net/http/httptest"
@@ -18,6 +17,7 @@ import (
 	"code.gitea.io/gitea/routers/routes"
 
 	"gitea.com/go-chi/session"
+	jsoniter "github.com/json-iterator/go"
 	"github.com/stretchr/testify/assert"
 )
 
@@ -62,6 +62,8 @@ func TestSessionFileCreation(t *testing.T) {
 	}()
 
 	var config session.Options
+
+	json := jsoniter.ConfigCompatibleWithStandardLibrary
 	err := json.Unmarshal([]byte(oldSessionConfig), &config)
 	assert.NoError(t, err)