nano: Update to 8.5

nano: Update to 8.5

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

    "Anchors are now saved when a file is closed, and restored when
    the file is reopened -- if and when --positionlog is active.
    Nano exits with an error status upon keystrokes ^O^Q and ^X^Q.
    Keystroke ^L just centers the cursor, while M-% cycles it.
    Option --whitespace is accepted, but left undocumented.
    Syntax coloring now works correctly in more locales."

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