hping: Update homepage

The [hping.org](www.hping.org) url lapsed sometime in 2023 ([last
capture]). It appears to now be a korean gambling site. I'm updating it
to the [source repository] the package pulls from instead.

Alternately, we could use the [last capture] link from archive.org
instead, but as far as I can tell that seems to be a less common
solution accross nixpgs (I found 11 instances for mostly small projects)

[source repository]: https://github.com/antirez/hping
[last capture]:
https://web.archive.org/web/20221101000000*/www.hping.org

pkgs/by-name/hp/hping/package.nix

@@ -62,7 +62,7 @@ stdenv.mkDerivation {
 
   meta = with lib; {
     description = "Command-line oriented TCP/IP packet assembler/analyzer";
-    homepage = "http://www.hping.org/";
+    homepage = "https://github.com/antirez/hping";
     license = licenses.gpl2Only;
     platforms = platforms.unix;
   };