docs

Since Python 3.13, the IOBase finalizer now logs
any errors raised by the close() method
https://docs.python.org/3/whatsnew/3.13.html#io

According to
https://docs.python.org/3.13/library/io.html#io.IOBase.close
if the file (descriptor) is accessed after being close,
`ValueError` is raised.

The `fd` is copied with `copy.copy()`.
Both gets automatically closed once the function ends,
the second can’t close a second time the same fd,
that’s why we get this error.

Not sure if there is a use case with the fd copy
Fix: remove fd copy