Variadic parameter is not compatible / contravariant with a parameter from an interface

# Bug report

After updating to `0.12.26` started to show an error such 
```
Parameter #n $params (array<int, mixed>) of method              
Class::method() is not compatible with  
parameter #n $params (mixed) of method                          
Interface::method().
```

At the playground it's a bit different: https://phpstan.org/r/d75d5610-04ca-4b95-b7b8-5b9ae55c9141
