Disable nixpkgs inputs of doom-overlay

They should be unused as all we're using is the overlay. Let's make that
explicit.

flake.lock

@@ -19,17 +19,15 @@
     "emacs-overlay": {
       "inputs": {
         "flake-utils": "flake-utils",
-        "nixpkgs": "nixpkgs",
-        "nixpkgs-stable": [
-          "nixpkgs"
-        ]
+        "nixpkgs": [],
+        "nixpkgs-stable": []
       },
       "locked": {
-        "lastModified": 1714813374,
-        "narHash": "sha256-x6I9usdTzVkxK09Jh576ieYDEfCeB4RTNclt11qKeh4=",
+        "lastModified": 1715046400,
+        "narHash": "sha256-gryLgWTbv1C4/j/6YleqQ5UmJQwa+UdkXEaemwhkGlM=",
         "owner": "nix-community",
         "repo": "emacs-overlay",
-        "rev": "95efc569e1dd1fd3f25aeb1baaf754415e4eafe2",
+        "rev": "f2804916dbc4655722f743b5299b6f706335b25b",
         "type": "github"
       },
       "original": {
@@ -58,26 +56,10 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1714635257,
-        "narHash": "sha256-4cPymbty65RvF1DWQfc+Bc8B233A1BWxJnNULJKQ1EY=",
-        "owner": "NixOS",
-        "repo": "nixpkgs",
-        "rev": "63c3a29ca82437c87573e4c6919b09a24ea61b0f",
-        "type": "github"
-      },
-      "original": {
-        "owner": "NixOS",
-        "ref": "nixos-unstable",
-        "repo": "nixpkgs",
-        "type": "github"
-      }
-    },
-    "nixpkgs_2": {
-      "locked": {
-        "lastModified": 1714531828,
-        "narHash": "sha256-ILsf3bdY/hNNI/Hu5bSt2/KbmHaAVhBbNUOdGztTHEg=",
-        "path": "/nix/store/nsaxv5k14h91rcxfqkinxzpp156217k6-source",
-        "rev": "0638fe2715d998fa81d173aad264eb671ce2ebc1",
+        "lastModified": 1714971268,
+        "narHash": "sha256-IKwMSwHj9+ec660l+I4tki/1NRoeGpyA2GdtdYpAgEw=",
+        "path": "/nix/store/p648p3av68k4h6li0126ddkznmr1mj2s-source",
+        "rev": "27c13997bf450a01219899f5a83bd6ffbfc70d3c",
         "type": "path"
       },
       "original": {
@@ -89,7 +71,7 @@
       "inputs": {
         "doomemacs": "doomemacs",
         "emacs-overlay": "emacs-overlay",
-        "nixpkgs": "nixpkgs_2"
+        "nixpkgs": "nixpkgs"
       }
     },
     "systems": {

flake.nix

@@ -22,7 +22,9 @@
     emacs-overlay = {
       url = "github:nix-community/emacs-overlay";
       inputs = {
-        nixpkgs-stable.follows = "nixpkgs";
+        # These should be unused, but let's unset them to make that explicit.
+        nixpkgs-stable.follows = "";
+        nixpkgs.follows = "";
       };
     };
   };