Fix the stable version of `AsFd for Arc<T>` and `Box<T>` These merged in #97437 for 1.64.0, apart from the main `io_safety` feature that stabilized in 1.63.0.
Fix the stable version of `AsFd for Arc<T>` and `Box<T>` These merged in #97437 for 1.64.0, apart from the main `io_safety` feature that stabilized in 1.63.0.