Close raw file in threaded gzip reader

Author: rhpvorderman

src/isal/igzip_threaded.py

@@ -141,6 +141,7 @@ def close(self) -> None:
         self.running = False
         self.worker.join()
         self.fileobj.close()
+        self.raw.close()
         self._closed = True
 
     @property