Handle .sass file extensions

Hi, I wanted to use .sass files in my project and I noticed that they aren't handled correctly in sass-bundle.

It is easily fixed by adding:

```php
        if (str_contains($path, '.sass')) {
            return str_replace('.sass', '.css', $path);
        }
```

In line 27 of `sass-bundle/src/AssetMapper/SassPublicPathAssetPathResolver.php`
And in line 45 in the same file