flake.{nix,lock}: use unstable nixpkgs, bump

flake.lock

@@ -2,17 +2,18 @@
   "nodes": {
     "nixpkgs": {
       "locked": {
-        "lastModified": 1723556749,
+        "lastModified": 1742169275,
-        "narHash": "sha256-+CHVZnTnIYRLYsARInHYoWkujzcRkLY/gXm3s5bE52o=",
+        "narHash": "sha256-nkH2Edu9rClcsQp2PYBe8E6fp8LDPi2uDBQ6wyMdeXI=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "4a92571f9207810b559c9eac203d1f4d79830073",
+        "rev": "5d9b5431f967007b3952c057fc92af49a4c5f3b2",
         "type": "github"
       },
       "original": {
-        "id": "nixpkgs",
+        "owner": "NixOS",
-        "ref": "nixos-24.05",
+        "ref": "nixpkgs-unstable",
-        "type": "indirect"
+        "repo": "nixpkgs",
+        "type": "github"
       }
     },
     "root": {

flake.nix

@@ -1,6 +1,6 @@
 {
   inputs = {
-    nixpkgs.url = "nixpkgs/nixos-24.05";
+    nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
   };
 
   outputs = { self, nixpkgs }: let