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;
} }`

Start by reproducing the report with flutter_cache_manager 3.3.1, a 60-second stalePeriod, and getFileStream as shown in the issue. Trace the cache cleanup behavior from this usage and verify that cached files are removed after the configured stale period.

索引モデルが issue の本文から書いたものです。