Create coroutine memory leak

GopherLua V1.1.1
GO V1.20.14 windows/amd64


```
co, _ := L.NewThread()
fn := L.GetGlobal("XXXXX").(*lua.LFunction) /* get function from lua */
L.Resume(co, fn)
```
When I repeatedly call this code, the memory keeps increasing!
How to solve the memory leak?

