nix: update flake to latest unstable nixpkgs

flake.lock

@@ -37,22 +37,6 @@
         "type": "github"
       }
     },
-    "flake-compat_2": {
-      "flake": false,
-      "locked": {
-        "lastModified": 1717312683,
-        "narHash": "sha256-FrlieJH50AuvagamEvWMIE6D2OAnERuDboFDYAED/dE=",
-        "owner": "nix-community",
-        "repo": "flake-compat",
-        "rev": "38fd3954cf65ce6faf3d0d45cd26059e059f07ea",
-        "type": "github"
-      },
-      "original": {
-        "owner": "nix-community",
-        "repo": "flake-compat",
-        "type": "github"
-      }
-    },
     "flake-parts": {
       "inputs": {
         "nixpkgs-lib": [
@@ -148,11 +132,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1733047432,
+        "lastModified": 1733105089,
-        "narHash": "sha256-fQUKxgxAEHlL5bevRkdsQB7sSpAMhlvxf7Zw0KK8QIg=",
+        "narHash": "sha256-Qs3YmoLYUJ8g4RkFj2rMrzrP91e4ShAioC9s+vG6ENM=",
         "owner": "LnL7",
         "repo": "nix-darwin",
-        "rev": "e30a3622b606dffc622305b4bbe1cfe37e78fa40",
+        "rev": "c6b65d946097baf3915dd51373251de98199280d",
         "type": "github"
       },
       "original": {
@@ -161,34 +145,13 @@
         "type": "github"
       }
     },
-    "nixos-cosmic": {
-      "inputs": {
-        "flake-compat": "flake-compat_2",
-        "nixpkgs": "nixpkgs",
-        "nixpkgs-stable": "nixpkgs-stable_2",
-        "rust-overlay": "rust-overlay_2"
-      },
-      "locked": {
-        "lastModified": 1733009147,
-        "narHash": "sha256-ioE5M49nUcGVu1OsdbSJ/29YAVXueRr/CFjnTT1Jyp8=",
-        "owner": "lilyinstarlight",
-        "repo": "nixos-cosmic",
-        "rev": "24c8e2624356e9e6077b087510c13b600ba6858a",
-        "type": "github"
-      },
-      "original": {
-        "owner": "lilyinstarlight",
-        "repo": "nixos-cosmic",
-        "type": "github"
-      }
-    },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1732521221,
+        "lastModified": 1733015953,
-        "narHash": "sha256-2ThgXBUXAE1oFsVATK1ZX9IjPcS4nKFOAjhPNKuiMn0=",
+        "narHash": "sha256-t4BBVpwG9B4hLgc6GUBuj3cjU7lP/PJfpTHuSqE+crk=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "4633a7c72337ea8fd23a4f2ba3972865e3ec685d",
+        "rev": "ac35b104800bff9028425fec3b6e8a41de2bbfff",
         "type": "github"
       },
       "original": {
@@ -214,38 +177,6 @@
         "type": "github"
       }
     },
-    "nixpkgs-stable_2": {
-      "locked": {
-        "lastModified": 1732749044,
-        "narHash": "sha256-T38FQOg0BV5M8FN1712fovzNakSOENEYs+CSkg31C9Y=",
-        "owner": "NixOS",
-        "repo": "nixpkgs",
-        "rev": "0c5b4ecbed5b155b705336aa96d878e55acd8685",
-        "type": "github"
-      },
-      "original": {
-        "owner": "NixOS",
-        "ref": "nixos-24.05",
-        "repo": "nixpkgs",
-        "type": "github"
-      }
-    },
-    "nixpkgs_2": {
-      "locked": {
-        "lastModified": 1732837521,
-        "narHash": "sha256-jNRNr49UiuIwaarqijgdTR2qLPifxsVhlJrKzQ8XUIE=",
-        "owner": "NixOS",
-        "repo": "nixpkgs",
-        "rev": "970e93b9f82e2a0f3675757eb0bfc73297cc6370",
-        "type": "github"
-      },
-      "original": {
-        "owner": "NixOS",
-        "ref": "nixos-unstable",
-        "repo": "nixpkgs",
-        "type": "github"
-      }
-    },
     "pre-commit-hooks-nix": {
       "inputs": {
         "flake-compat": [
@@ -277,8 +208,7 @@
       "inputs": {
         "lanzaboote": "lanzaboote",
         "nix-darwin": "nix-darwin",
-        "nixos-cosmic": "nixos-cosmic",
+        "nixpkgs": "nixpkgs"
-        "nixpkgs": "nixpkgs_2"
       }
     },
     "rust-overlay": {
@@ -306,27 +236,6 @@
         "type": "github"
       }
     },
-    "rust-overlay_2": {
-      "inputs": {
-        "nixpkgs": [
-          "nixos-cosmic",
-          "nixpkgs"
-        ]
-      },
-      "locked": {
-        "lastModified": 1732847586,
-        "narHash": "sha256-SnHHSBNZ+aj8mRzYxb6yXBl9ei3K3j5agC/D8Vjw/no=",
-        "owner": "oxalica",
-        "repo": "rust-overlay",
-        "rev": "97210ddff72fe139815f4c1ac5da74b5b0dde2d7",
-        "type": "github"
-      },
-      "original": {
-        "owner": "oxalica",
-        "repo": "rust-overlay",
-        "type": "github"
-      }
-    },
     "systems": {
       "locked": {
         "lastModified": 1681028828,