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Fix `function-no-unknown` false negatives for functions with namespace (#888)

Since Stylelint 15.8.0, the built-in `function-no-unknown` rule has ignored SCSS functions with namespace.

For example, the following code unexpectedly passes with Stylelint 15.8.0:

```scss
a { color: color.unknown(#fff); }
```

Notes:
- This change keeps backward compatibility. This means not to change `peerDependencies.stylelint` in `package.json`.
- This change may bring performance penalty to keep backward compatibility.
- Run `npm i 'stylelint@^15.8.0' && npm t` to test this change with newer versions of Stylelint.

See also:
- https://github.com/stylelint/stylelint/releases/tag/15.8.0
- https://github.com/stylelint/stylelint/pull/6921

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