net/http_ping: Deprecate and set expiration date to 2024-02-29

Only supports HTTP/1.0 which is considered deprecated and being
phased out.

If the functionality is still of interest
https://github.com/fever-ch/http-ping appears to be a good replacement

PR:		276186
Approved by:	portmgr (maintainer timeout, 2+ weeks)

net/http_ping/Makefile

@@ -9,6 +9,9 @@ MAINTAINER=	hrs@FreeBSD.org
 COMMENT=	Measure HTTP Latency
 WWW=		https://www.acme.com/software/http_ping/
 
+DEPRECATED=	Supports only HTTP/1.0
+EXPIRATION_DATE=2024-02-29
+
 USES=		ssl
 WRKSRC=		${WRKDIR}/${PORTNAME}
 CFLAGS+=	-I${OPENSSLINC}