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Disallow parent selectors in `selector-append` (#2760)

Now correctly errors on inputs such as this one instead of crashing (see #2663):

```scss
div {
  a: selector-append('.menu', 'li', '&');
}
```

```
Error: Parent selectors aren't allowed here.
        on line 3:37 of ../../../tmp/test.scss, in function `selector-append`
        from line 3:6 of ../../../tmp/test.scss
>>   e: selector-append('.menu', 'li', '&');

   ------------------------------------^
```

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