Remove nixpkgs 23.05 usage

flake.lock

@@ -408,22 +408,6 @@
         "type": "github"
       }
     },
-    "nixpkgs-23-05": {
-      "locked": {
-        "lastModified": 1704290814,
-        "narHash": "sha256-LWvKHp7kGxk/GEtlrGYV68qIvPHkU9iToomNFGagixU=",
-        "owner": "nixos",
-        "repo": "nixpkgs",
-        "rev": "70bdadeb94ffc8806c0570eb5c2695ad29f0e421",
-        "type": "github"
-      },
-      "original": {
-        "owner": "nixos",
-        "ref": "nixos-23.05",
-        "repo": "nixpkgs",
-        "type": "github"
-      }
-    },
     "nixpkgs-25_05": {
       "locked": {
         "lastModified": 1747610100,
@@ -493,7 +477,6 @@
         "nix-index-database": "nix-index-database",
         "nixos-mailserver": "nixos-mailserver",
         "nixpkgs": "nixpkgs",
-        "nixpkgs-23-05": "nixpkgs-23-05",
         "nur": "nur",
         "systems": "systems",
         "tetris": "tetris",

flake.nix

@@ -74,7 +74,6 @@
       inputs.nixpkgs.follows = "nixpkgs";
     };
     nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
-    nixpkgs-23-05.url = "github:nixos/nixpkgs/nixos-23.05";
     nix-index-database = {
       url = "github:Mic92/nix-index-database";
       inputs.nixpkgs.follows = "nixpkgs";

shells/silverfin.nix

@@ -50,13 +50,7 @@ pkgs.devshell.mkShell {
     minikube
     mupdf-headless
     nodejs_22
-    (inputs.nixpkgs-23-05.legacyPackages.aarch64-darwin.poppler_utils.overrideAttrs (old: rec {
-      version = "22.12.0";
-      src = pkgs.fetchurl {
-        url = "https://poppler.freedesktop.org/poppler-${version}.tar.xz";
-        hash = "sha256-2aqcrN+9D46Y/Cs7sAjmRVl+1IBoV1fD57x0tCeNFcA=";
-      };
-    }))
+    poppler_utils
     (pkgs.lowPrio postgresql_14)
     stern
     yarn