Use JSON module instead of stdlib json (#18003)

modules/updatechecker/update_checker.go

@@ -5,11 +5,11 @@
 package updatechecker
 
 import (
-	"encoding/json"
 	"io/ioutil"
 	"net/http"
 
 	"code.gitea.io/gitea/modules/appstate"
+	"code.gitea.io/gitea/modules/json"
 	"code.gitea.io/gitea/modules/proxy"
 	"code.gitea.io/gitea/modules/setting"
 

routers/web/repo/projects.go

@@ -5,7 +5,6 @@
 package repo
 
 import (
-	"encoding/json"
 	"fmt"
 	"net/http"
 	"net/url"
@@ -16,6 +15,7 @@ import (
 	"code.gitea.io/gitea/models/unit"
 	"code.gitea.io/gitea/modules/base"
 	"code.gitea.io/gitea/modules/context"
+	"code.gitea.io/gitea/modules/json"
 	"code.gitea.io/gitea/modules/markup"
 	"code.gitea.io/gitea/modules/markup/markdown"
 	"code.gitea.io/gitea/modules/setting"