nano: Update to 7.0

nano: Update to 7.0

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

"2022 November 15 - GNU nano 7.0 "Una existencia simple bajo el sol"

    String binds may contain bindable function names between braces.
    For example, to move the current line down to after the next one:
    bind ^D "{cut}{down}{paste}{up}" main. Of course, braced function
    names may be mixed with literal text. If an existing string bind
    contains a literal {, replace it with {{}.
    Unicode codes can be entered (via M-V) without leading zeroes,
    by finishing short codes with <Space> or <Enter>.
    Word completion (^]) looks for candidates in all open buffers.
    No regular expression matches the final empty line any more."

Signed-off-by: Matthias Fischer <matthias.fischer@ipfire.org>
Reviewed-by: Peter Müller <peter.mueller@ipfire.org>