fix: Drop nixpkgs input

flake.lock

@@ -20,18 +20,15 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1741246872,
-        "narHash": "sha256-Q6pMP4a9ed636qilcYX8XUguvKl/0/LGXhHcRI91p0U=",
-        "owner": "nixos",
-        "repo": "nixpkgs",
-        "rev": "10069ef4cf863633f57238f179a0297de84bd8d3",
-        "type": "github"
+        "lastModified": 1741010256,
+        "narHash": "sha256-WZNlK/KX7Sni0RyqLSqLPbK8k08Kq7H7RijPJbq9KHM=",
+        "path": "/nix/store/jk6xpbfh10gz6q5cqw8b2f7xk0pl7hkv-source",
+        "rev": "ba487dbc9d04e0634c64e3b1f0d25839a0a68246",
+        "type": "path"
       },
       "original": {
-        "owner": "nixos",
-        "ref": "nixos-unstable",
-        "repo": "nixpkgs",
-        "type": "github"
+        "id": "nixpkgs",
+        "type": "indirect"
       }
     },
     "root": {

flake.nix

@@ -2,17 +2,13 @@
   description = "jiriks74's ZSH configuration";
 
   inputs = {
-    nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
     flake-utils.url = "github:numtide/flake-utils";
   };
 
   outputs = {
-    self,
     nixpkgs,
-    flake-utils,
     ...
-  } @ inputs: let
-    inherit (self) outputs;
+  }: let
     # Supported systems for your flake packages, shell, etc.
     systems = [
       "aarch64-linux"