flake.lock: Update

Flake lock file updates:

• Updated input 'nixpkgs':
    'github:NixOS/nixpkgs/55fbb1d20ce4350aae11bba71844796549175ab1' (2023-02-01)
  → 'github:NixOS/nixpkgs/d13b0f290c4969d26decd23415a6d38912a035ae' (2023-02-08)
• Updated input 'treefmt-nix':
    'github:numtide/treefmt-nix/d5ed9a1e6793f99b2e179d5dec9639e48ef22db7' (2023-01-23)
  → 'github:numtide/treefmt-nix/9e64e351b42d9da33a4e8a72b858612c48d1a924' (2023-02-07)
• Added input 'treefmt-nix/nixpkgs':
    'github:nixos/nixpkgs/0591d6b57bfeb55dfeec99a671843337bc2c3323' (2023-02-04)

flake.lock

@@ -22,11 +22,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1675246915,
+        "lastModified": 1675866582,
-        "narHash": "sha256-q3E67PIRNQyWKtg43grNYYAZT/ik9oyOsRvHYah0iJQ=",
+        "narHash": "sha256-0bucFq/bi5uho1MJEhYTI8Y15dVNyukcUD6XnfkJNfg=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "55fbb1d20ce4350aae11bba71844796549175ab1",
+        "rev": "d13b0f290c4969d26decd23415a6d38912a035ae",
         "type": "github"
       },
       "original": {
@@ -36,6 +36,22 @@
         "type": "github"
       }
     },
+    "nixpkgs_2": {
+      "locked": {
+        "lastModified": 1675545634,
+        "narHash": "sha256-TbQeQcM5TA/wIho6xtzG+inUfiGzUXi8ewwttiQWYJE=",
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "rev": "0591d6b57bfeb55dfeec99a671843337bc2c3323",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nixos",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
     "root": {
       "inputs": {
         "flake-parts": "flake-parts",
@@ -44,12 +60,15 @@
       }
     },
     "treefmt-nix": {
+      "inputs": {
+        "nixpkgs": "nixpkgs_2"
+      },
       "locked": {
-        "lastModified": 1674470002,
+        "lastModified": 1675790908,
-        "narHash": "sha256-Tk1VaMeBTMMGEZeqv3TEwrTAdR9fYb3EH/TPI27AdKk=",
+        "narHash": "sha256-NeRMRfKKIFt0tkTEV0+bHh3+35zY6lpeAEO5wSA9+6k=",
         "owner": "numtide",
         "repo": "treefmt-nix",
-        "rev": "d5ed9a1e6793f99b2e179d5dec9639e48ef22db7",
+        "rev": "9e64e351b42d9da33a4e8a72b858612c48d1a924",
         "type": "github"
       },
       "original": {