nixos/pam: remove pam_cgfs

pam_cgfs is a cgroups-v1 pam module. Verified with upstream that
this module no longer necessary on cgroups-v2 systems.

nixos/modules/security/pam.nix

@@ -867,9 +867,6 @@ let
           { name = "gnupg"; enable = cfg.gnupg.enable; control = "optional"; modulePath = "${pkgs.pam_gnupg}/lib/security/pam_gnupg.so"; settings = {
             no-autostart = cfg.gnupg.noAutostart;
           }; }
-          { name = "cgfs"; enable = config.virtualisation.lxc.lxcfs.enable; control = "optional"; modulePath = "${pkgs.lxc}/lib/security/pam_cgfs.so"; args = [
-            "-c" "all"
-          ]; }
         ];
       };
     };

pkgs/os-specific/linux/lxc/default.nix

@@ -12,7 +12,6 @@
   nix-update-script,
   nixosTests,
   openssl,
-  pam,
   pkg-config,
   systemd,
 }:
@@ -41,7 +40,6 @@ stdenv.mkDerivation rec {
     libseccomp
     libselinux
     openssl
-    pam
     systemd
   ];