use experimental go json v2 library (go-gitea#35392)

details: https://pkg.go.dev/encoding/json/v2

---------

Co-authored-by: techknowlogick <[email protected]>
Co-authored-by: wxiaoguang <[email protected]>

Author: 3 people

go.mod

@@ -279,11 +279,11 @@ require (
 	go.uber.org/zap/exp v0.3.0 // indirect
 	go.yaml.in/yaml/v2 v2.4.3 // indirect
 	go4.org v0.0.0-20230225012048-214862532bf5 // indirect
-	golang.org/x/exp v0.0.0-20250911091902-df9299821621 // indirect
-	golang.org/x/mod v0.28.0 // indirect
-	golang.org/x/time v0.13.0 // indirect
-	golang.org/x/tools v0.37.0 // indirect
-	google.golang.org/genproto/googleapis/rpc v0.0.0-20250908214217-97024824d090 // indirect
+	golang.org/x/exp v0.0.0-20250819193227-8b4c13bb791b // indirect
+	golang.org/x/mod v0.27.0 // indirect
+	golang.org/x/time v0.12.0 // indirect
+	golang.org/x/tools v0.36.0 // indirect
+	google.golang.org/genproto/googleapis/rpc v0.0.0-20250826171959-ef028d996bc1 // indirect
 	gopkg.in/warnings.v0 v0.1.2 // indirect
 	gopkg.in/yaml.v2 v2.4.0 // indirect
 )