Fix missed migration in #22235 (#23482)

Co-authored-by: techknowlogick <techknowlogick@gitea.io>
Co-authored-by: KN4CK3R <admin@oldschoolhack.me>

models/migrations/v1_20/v246.go

@@ -0,0 +1,16 @@
+// Copyright 2023 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package v1_20 //nolint
+
+import (
+	"xorm.io/xorm"
+)
+
+func AddNewColumnForProject(x *xorm.Engine) error {
+	type Project struct {
+		OwnerID int64 `xorm:"INDEX"`
+	}
+
+	return x.Sync(new(Project))
+}