Repair for type checking

Author: aiphee

src/Caching/Storages/FileStorage.php

@@ -295,7 +295,7 @@ public function clean(array $conditions): void
 				if (is_dir($dir)) {
 					$items = Nette\Utils\Finder::findFiles('')->from($dir);
 					foreach ($items as $item) {
-						$this->delete($item);
+						$this->delete((string)$item);
 					}
 					@rmdir($dir);
 				}