always include gitMinimal

the condition was actually the wrong way around and we still need git in
nix for some operations.

nixosModules/clanCore/packages.nix

@@ -1,12 +1,9 @@
 {
   pkgs,
-  lib,
-  config,
   ...
 }:
 {
-  environment.systemPackages =
-    [
+  environment.systemPackages = [
     # essential debugging tools for networked services
     pkgs.dnsutils
     pkgs.tcpdump
@@ -15,9 +12,7 @@
     pkgs.htop
 
     pkgs.nixos-facter # for `clan machines update-hardware-config --backend nixos-facter`
-    ]
-    ++ lib.optional (lib.versionAtLeast config.nix.package.version "2.24")
-      # needed to deploy via `clan machines update` if the flake has a git input
-      # newer version of nix do have `libgit2`
-      pkgs.gitMinimal;
+
+    pkgs.gitMinimal
+  ];
 }