GHSA-xcx6-vp38-8hr5: Scriban has Uncontrolled Recursion in `object.to_json` Causing Unrecoverable Process Crash via StackOverflowException

The object.to_json builtin function in Scriban performs recursive JSON serialization via an internal WriteValue() static local function that has no depth limit, no circular reference detection, and no stack overflow guard. A Scriban template containing a self-referencing object passed to object.to_json triggers unbounded recursion, causing a StackOverflowException that terminates the hosting .NET process. This is a fatal, unrecoverable crash — StackOverflowException cannot be caught by user code in .NET.