Update tfo-go

inbound/default_tcp_nongo1.20.go

@@ -0,0 +1,15 @@
+//go:build !go1.20
+
+package inbound
+
+import (
+	"context"
+	"net"
+	"os"
+)
+
+const go120Available = false
+
+func listenTFO(listenConfig net.ListenConfig, ctx context.Context, network string, address string) (net.Listener, error) {
+	return nil, os.ErrInvalid
+}