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>

routers/api/v1/utils/hook.go

@@ -5,7 +5,6 @@
 package utils
 
 import (
-	"encoding/json"
 	"fmt"
 	"net/http"
 	"strings"
@@ -17,6 +16,7 @@ import (
 	"code.gitea.io/gitea/modules/util"
 	"code.gitea.io/gitea/routers/utils"
 	"code.gitea.io/gitea/services/webhook"
+	jsoniter "github.com/json-iterator/go"
 )
 
 // GetOrgHook get an organization's webhook. If there is an error, write to
@@ -147,6 +147,7 @@ func addHook(ctx *context.APIContext, form *api.CreateHookOption, orgID, repoID
 			return nil, false
 		}
 
+		json := jsoniter.ConfigCompatibleWithStandardLibrary
 		meta, err := json.Marshal(&webhook.SlackMeta{
 			Channel:  strings.TrimSpace(channel),
 			Username: form.Config["username"],
@@ -221,6 +222,7 @@ func editHook(ctx *context.APIContext, form *api.EditHookOption, w *models.Webho
 
 		if w.Type == models.SLACK {
 			if channel, ok := form.Config["channel"]; ok {
+				json := jsoniter.ConfigCompatibleWithStandardLibrary
 				meta, err := json.Marshal(&webhook.SlackMeta{
 					Channel:  channel,
 					Username: form.Config["username"],