www/node16: Mark DEPRECATED

nodejs comunity has decided to change the End-of-life date to match the
end of life date of OpenSSL 1.1.1 which is on 2023-09-11. Based on that
mark this port DEPRECATED and set to expire by the end of this quarterly
on 2023-09-30.

See also:
https://nodejs.org/en/blog/announcements/nodejs16-eol

Approved by: portmgr (blanket)