setfenv

### How are you using the lua-language-server?

Visual Studio Code Extension (sumneko.lua)

### Which OS are you using?

Linux

### What is the issue affecting?

Diagnostics/Syntax Checking

### Expected Behaviour

no error

### Actual Behaviour

```
Cannot assign `integer` to parameter `fun(...any):...integer|unknown`.
- `integer` cannot match `fun(...any):...integer|unknown`
- Type `integer` cannot match `fun(...any):...integer|unknown`
- Type `number` cannot match `fun(...any):...integer|unknown`Lua Diagnostics.(param-type-mismatch)
```

### Reproduction steps

Lua version 5.1
setfenv(, )

### Additional Notes

maybe change definition from
`---
---Sets the environment to be used by the given function.
---
---[View documents](http://www.lua.org/manual/5.1/manual.html#pdf-setfenv)
---
---@param f async fun(...):...|integer
---@param table table
---@return function
function setfenv(f, table) end`

to
`---
---Sets the environment to be used by the given function.
---
---[View documents](http://www.lua.org/manual/5.1/manual.html#pdf-setfenv)
---
---@param f integer|async fun(...):...
---@param table table
---@return function
function setfenv(f, table) end`

### Log File

_No response_

Start by locating the setfenv definition shown in the issue and compare its first parameter annotation with Lua 5.1's accepted argument forms. Reproduce the example in the Lua language server and verify that setfenv(, ) no longer reports a parameter-type mismatch.

Written by the indexing model from the issue text.