Remove nixpkgs-2205

It isn’t used anymore.

flake.lock

@@ -240,22 +240,6 @@
         "type": "github"
       }
     },
-    "nixpkgs-2205": {
-      "locked": {
-        "lastModified": 1672580127,
-        "narHash": "sha256-3lW3xZslREhJogoOkjeZtlBtvFMyxHku7I/9IVehhT8=",
-        "owner": "nixos",
-        "repo": "nixpkgs",
-        "rev": "0874168639713f547c05947c76124f78441ea46c",
-        "type": "github"
-      },
-      "original": {
-        "owner": "nixos",
-        "ref": "nixos-22.05",
-        "repo": "nixpkgs",
-        "type": "github"
-      }
-    },
     "nixpkgs-overlay": {
       "inputs": {
         "flake-utils": [
@@ -380,7 +364,6 @@
         "nix-pre-commit-hooks": "nix-pre-commit-hooks",
         "nixos-hardware": "nixos-hardware",
         "nixpkgs": "nixpkgs",
-        "nixpkgs-2205": "nixpkgs-2205",
         "nixpkgs-overlay": "nixpkgs-overlay",
         "nixpkgs-unstable": "nixpkgs-unstable",
         "password-hash-self-service": "password-hash-self-service",

flake.nix

@@ -6,7 +6,6 @@
 
     nixpkgs.url = "github:nixos/nixpkgs/nixos-22.11";
     nixpkgs-unstable.url = "github:nixos/nixpkgs/nixos-unstable";
-    nixpkgs-2205.url = "github:nixos/nixpkgs/nixos-22.05";
 
     home-manager.url = "github:nix-community/home-manager/release-22.11";
     home-manager.inputs.nixpkgs.follows = "nixpkgs";

modules/nix.nix

@@ -60,12 +60,6 @@ in
           overlays
           system;
       };
-      _2205 = import nixpkgs-2205 {
-        inherit (config.nixpkgs)
-          config
-          overlays
-          system;
-      };
     })
   ];