flake.lock: Update

Flake lock file updates:

```
• Updated input 'nixpkgs':
    'github:nixos/nixpkgs/2baa12ff69913392faf0ace833bc54bba297ea95' (2025-05-21)
  → 'github:nixos/nixpkgs/f09dede81861f3a83f7f06641ead34f02f37597f' (2025-05-23)
• Updated input 'nixpkgs-unstable':
    'github:nixos/nixpkgs/063f43f2dbdef86376cc29ad646c45c46e93234c' (2025-05-23)
  → 'github:nixos/nixpkgs/4faa5f5321320e49a78ae7848582f684d64783e9' (2025-05-27)
• Updated input 'treefmt-nix':
    'github:numtide/treefmt-nix/020cb423808365fa3f10ff4cb8c0a25df35065a3' (2025-05-22)
  → 'github:numtide/treefmt-nix/1f3f7b784643d488ba4bf315638b2b0a4c5fb007' (2025-05-26)
```

flake.lock

@@ -36,11 +36,11 @@
     },
     "nixpkgs-unstable": {
       "locked": {
-        "lastModified": 1748190013,
+        "lastModified": 1748370509,
-        "narHash": "sha256-R5HJFflOfsP5FBtk+zE8FpL8uqE7n62jqOsADvVshhE=",
+        "narHash": "sha256-QlL8slIgc16W5UaI3w7xHQEP+Qmv/6vSNTpoZrrSlbk=",
         "owner": "nixos",
         "repo": "nixpkgs",
-        "rev": "62b852f6c6742134ade1abdd2a21685fd617a291",
+        "rev": "4faa5f5321320e49a78ae7848582f684d64783e9",
         "type": "github"
       },
       "original": {