FIx Deprecated Implicit Nullable Parameter in compileFile Method for PHP 8.4.1 Compatibility

[medofrh]

The compileFile method in Compiler.php line 60 uses an implicitly nullable parameter $cssFilePath without explicitly marking it as nullable, which triggers a deprecation notice in PHP 8.4.1. This needs to be updated to ensure compatibility with PHP 8.4.1 and future versions.

the current method is:

public static function compileFile(string $scssFilePath, array $variables, string $cssFilePath = null, bool $useSourceMap = false, string $outputStyle = OutputStyle::COMPRESSED): string

To fix this issue, $cssFilePAth should be explicitly marked as nullable using ?String, as follows:

public static function compileFile(string $scssFilePath, array $variables, ?string $cssFilePath = null, bool $useSourceMap = false, string $outputStyle = OutputStyle::COMPRESSED): string

Thank you for addressing this issue!