Add optimistic lock to ActionRun table (#26563)

Should fix #26559.

How xorm works: https://xorm.io/docs/chapter-06/1.lock/

---------

Co-authored-by: Giteabot <teabot@gitea.io>

models/migrations/v1_21/v272.go

@@ -0,0 +1,14 @@
+// Copyright 2023 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package v1_21 //nolint
+import (
+	"xorm.io/xorm"
+)
+
+func AddVersionToActionRunTable(x *xorm.Engine) error {
+	type ActionRun struct {
+		Version int `xorm:"version default 0"`
+	}
+	return x.Sync(new(ActionRun))
+}