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/api_helper_for_declarative_test.go

@@ -6,7 +6,6 @@ package integrations
 
 import (
 	"context"
-	"encoding/json"
 	"fmt"
 	"io/ioutil"
 	"net/http"
@@ -18,6 +17,7 @@ import (
 	"code.gitea.io/gitea/modules/queue"
 	api "code.gitea.io/gitea/modules/structs"
 
+	jsoniter "github.com/json-iterator/go"
 	"github.com/stretchr/testify/assert"
 )
 
@@ -212,6 +212,8 @@ func doAPICreatePullRequest(ctx APITestContext, owner, repo, baseBranch, headBra
 			expected = ctx.ExpectedCode
 		}
 		resp := ctx.Session.MakeRequest(t, req, expected)
+
+		json := jsoniter.ConfigCompatibleWithStandardLibrary
 		decoder := json.NewDecoder(resp.Body)
 		pr := api.PullRequest{}
 		err := decoder.Decode(&pr)