Stale period not working properly

` Im using **flutter_cache_manager: ^3.3.1** and the stale period its not working properly. its not automatically deleting the files.

final cacheManager = CacheManager(
Config(
id,
stalePeriod: Duration(seconds: 60),
maxNrOfCacheObjects: 10,
),
);

try {
final fileStream = cacheManager.getFileStream(_syncMusicUrl);

await for (var response in fileStream) {
if (response is FileInfo) {
_cacheMusicPath = response.file.path;

return true;
} else if (response is DownloadProgress) {}
}
return false;
} catch (error) {
syncSituation.value = "sync";
update();
return false;
} }`

首先按照 issue 中所示，使用 flutter_cache_manager 3.3.1、60 秒的 stalePeriod 和 getFileStream 重现报告。根据这种用法跟踪缓存清理行为，并验证缓存文件是否会在配置的 stalePeriod 之后被移除。

由索引模型根据 Issue 内容生成。