Migration v244.go should be v243.go (#22988)

models/migrations/v1_19/v243.go

@@ -0,0 +1,16 @@
+// Copyright 2023 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package v1_19 //nolint
+
+import (
+	"xorm.io/xorm"
+)
+
+func AddExclusiveLabel(x *xorm.Engine) error {
+	type Label struct {
+		Exclusive bool
+	}
+
+	return x.Sync(new(Label))
+}