nano: Update to 8.4

nano: Update to 8.4

For details see:
https://www.nano-editor.org/news.php

"2025 April 2 - GNU nano 8.4 "Five Miles Out"

    - Bracketed pastes over a slow connection are more reliable.
    - Tabs in an external paste at a prompt are not dropped.
    - Feedback occurs when the cursor sits on a Byte Order Mark.
    - The Execute prompt is more forgiving of a typo."

Signed-off-by: Matthias Fischer <matthias.fischer@ipfire.org>