nano: upgraded package to upstream

Upgraded app-editors/nano to version 5.6.1 on amd64, arm

BUG=None
TEST=Basic editing and use as EDITOR to make a test git commit both
within the SDK and on lars and kukui boards.

When pressing ^G for help within an SSH session on a DUT, Nano exits
with the message "Bad toggle -- please report a bug". This does not
happen when run as part of the SDK. Confirmed behavior is consistent
with the previous version of Nano as well. May require a follow-up bug
report if one does not yet exist.

Change-Id: I651c3f8d5c1c8371afed266565038369ad48ea10
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/overlays/portage-stable/+/3036260
Reviewed-by: Benjamin Gordon <bmgordon@chromium.org>
Tested-by: Clayton Whitelaw <cawhitelaw@google.com>
Commit-Queue: Clayton Whitelaw <cawhitelaw@google.com>
4 files changed