CSS and JavaScript are still in cache after MMLC update

Found this `hash('crc32', $absPath)`, but we should use something like `hash('crc32', $mmlcVersion)`.
```php
$attributes = [
    'rel' => 'stylesheet',
    'type' => 'text/css',
    'href' => $stylesheetPath . '?v=' . hash('crc32', $absPath),
];
```