www/pycarddav: Deprecate port

Upstream has declared [1][2] the software deprecated:

"This project is dead. pyCardDAV is deprecated. See the relevant issue. A
good alternative is khard."

[1] http://lostpackets.de/pycarddav/
[2] https://github.com/geier/pycarddav

Set a 3 month expiry to give users sufficient time to migrate

PR: 220368
Reported by: rigoletto
Submitted by: Samir <samir noir im>
MFH: No