think-filesystem3.0不兼容php8.4

[HeroTianTYJ]

FinfoMimeTypeDetector.php文件第42行报错：League\MimeTypeDetection\FinfoMimeTypeDetector::__construct(): Implicitly marking parameter $extensionMap as nullable is deprecated, the explicit nullable type must be used instead
估计是因为think-filesystem库引入的league/flysystem版本过低了吧？