(🐞) False positive / bad fix for PYI015 with typealias in stub file

ruff 0.0.262 

```pyi
unicode = str  # PYI015 [*] Only simple default values allowed for assignments
```

# expected
```pyi
from typing import TypeAlias
unicode: TypeAlias = str
```
(Or just leaving it as is)

# actual
```pyi
unicode = ...
```