net/samba413: Mark DEPRECATED and set EXPIRATION_DATE

Samba 4.13 has already reached its EoL on March 21, 2022. The main
reason this port isn't removed yet is that Samba 4.16 (net/samba416)
doesn't work with FreeBSD 12. So mark DEPRECATED and set
EXPIRATION_DATE to December 31, 2023, the EoL day of FreeBSD 12.

PR: 267142
Approved by: maintainer timeout