Remove unused psalm error suppression

src/Cache/Engine/FileEngine.php

@@ -167,7 +167,6 @@ class FileEngine extends CacheEngine
 
         $this->_File->rewind();
         $time = time();
-        /** @psalm-suppress RiskyCast */
         $cachetime = (int)$this->_File->current();
 
         if ($cachetime < $time) {