[vim/vim] vim9: error in compileing unpack tuple (Issue #21057)

mao-yining created an issue (vim/vim#21057)

### Steps to reproduce

```vim
vim9script
var d: dict<tuple<dict<any>, list<any>>>
def A(): tuple<dict<any>, list<any>>
		return ({}, [])
enddef
def B()
		var [a; b] = d->get('a', (-1, {}, []))
		b = A()
		echo typename(b)
enddef
B()
```
Compile Error `E1012: Type mismatch; expected list<any> but got tuple<dict<any>, list<any>>`

### Expected behaviour

Compile succesfully

### Version of Vim

9.2.925

### Environment

MS-Windows 11

### Logs and stack traces

```shell

```

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