helvum: drop

This package was marked as unmaintained upstream [1] and depends on
the vulnerable shlex 1.2.0 [2].

[1] https://gitlab.freedesktop.org/pipewire/helvum
[2] https://www.cve.org/CVERecord?id=CVE-2024-58266

Author: thunze

pkgs/by-name/he/helvum/package.nix

@@ -885,6 +885,7 @@ mapAliases {
   hacpack = throw "hacpack has been removed from nixpkgs, as it has been taken down upstream"; # Added 2025-09-26
   harmony-music = throw "harmony-music is unmaintained and has been removed"; # Added 2025-08-26
   helix-gpt = throw "helix-gpt was deprecated in January 2026 and has been since removed"; # Added 2026-02-05
+  helvum = throw "'helvum' has been removed as it was unmaintained upstream and relied on a vulnerable dependency. Consider using 'crosspipe' instead."; # Added 2026-03-04
   HentaiAtHome = throw "'HentaiAtHome' has been renamed to/replaced by 'hentai-at-home'"; # Converted to throw 2025-10-27
   hiawatha = throw "hiawatha has been removed, since it is no longer actively supported upstream, nor well maintained in nixpkgs"; # Added 2025-09-10
   hibernate = throw "hibernate has been removed due to lack of maintenance"; # Added 2025-09-10