security/sssd: mark port deprecated

- Very old version of this port no longer supported
- sssd-devel has current versions

security/sssd/Makefile

@@ -8,6 +8,9 @@ MAINTAINER=	jhixson@FreeBSD.org
 COMMENT=	System Security Services Daemon
 WWW=		https://pagure.io/SSSD/sssd
 
+DEPRECATED=	Not supported, switch to sssd-devel
+EXPIRATION_DATE=	2024-12-31
+
 LICENSE=	GPLv3+
 LICENSE_FILE=	${WRKSRC}/COPYING