hive: Use stateVersion defined in the nodes metadata

hive.nix

@@ -19,6 +19,9 @@ let
 
     # Set NIX_PATH to the patched version of nixpkgs
     nix.nixPath = [ "nixpkgs=${mkNixpkgs node}" ];
+
+    # Use the stateVersion declared in the metadata
+    system = { inherit (metadata.nodes.${node}) stateVersion; };
   };
 
   mkNixpkgs = node:

machines/compute01/_configuration.nix

@@ -3,5 +3,4 @@
 {
   dgn-dns.enable = true;
 
-  system.stateVersion = "23.05"; # Did you read the comment?
 }

machines/storage01/_configuration.nix

@@ -5,5 +5,4 @@
 { config, pkgs, ... }:
 
 {
-  system.stateVersion = "23.05"; # Did you read the comment?
 }

machines/web01/_configuration.nix

@@ -13,12 +13,5 @@
 
   networking.hostName = name;
 
-  # This value determines the NixOS release from which the default
-  # settings for stateful data, like file locations and database versions
-  # on your system were taken. It‘s perfectly fine and recommended to leave
-  # this value at the release version of the first install of this system.
-  # Before changing this value read the documentation for this option
-  # (e.g. man configuration.nix or on https://nixos.org/nixos/options.html).
-  system.stateVersion = "22.11"; # Did you read the comment?
 
 }