update to fix builds on macos

flake.lock

@@ -198,9 +198,7 @@
         "cl-nix-lite": "cl-nix-lite",
         "flake-compat": "flake-compat",
         "flake-utils": "flake-utils",
-        "nixpkgs": [
-          "nixpkgs"
-        ],
+        "nixpkgs": "nixpkgs_3",
         "systems": "systems_2",
         "treefmt-nix": "treefmt-nix_2"
       },
@@ -339,6 +337,22 @@
       }
     },
     "nixpkgs_3": {
+      "locked": {
+        "lastModified": 1732617236,
+        "narHash": "sha256-PYkz6U0bSEaEB1al7O1XsqVNeSNS+s3NVclJw7YC43w=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "af51545ec9a44eadf3fe3547610a5cdd882bc34e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "af51545ec9a44eadf3fe3547610a5cdd882bc34e",
+        "type": "github"
+      }
+    },
+    "nixpkgs_4": {
       "locked": {
         "lastModified": 1761236834,
         "narHash": "sha256-+pthv6hrL5VLW2UqPdISGuLiUZ6SnAXdd2DdUE+fV2Q=",
@@ -354,7 +368,7 @@
         "type": "github"
       }
     },
-    "nixpkgs_4": {
+    "nixpkgs_5": {
       "locked": {
         "lastModified": 1770197578,
         "narHash": "sha256-AYqlWrX09+HvGs8zM6ebZ1pwUqjkfpnv8mewYwAo+iM=",
@@ -370,7 +384,7 @@
         "type": "github"
       }
     },
-    "nixpkgs_5": {
+    "nixpkgs_6": {
       "locked": {
         "lastModified": 1744536153,
         "narHash": "sha256-awS2zRgF4uTwrOKwwiJcByDzDOdo3Q1rPZbiHQg/N38=",
@@ -415,7 +429,7 @@
         "mac-app-util": "mac-app-util",
         "nix2vim": "nix2vim",
         "nixos-generators": "nixos-generators",
-        "nixpkgs": "nixpkgs_4",
+        "nixpkgs": "nixpkgs_5",
         "nixpkgs-stable": "nixpkgs-stable",
         "nur": "nur",
         "rust-overlay": "rust-overlay",
@@ -426,7 +440,7 @@
     },
     "rust-overlay": {
       "inputs": {
-        "nixpkgs": "nixpkgs_5"
+        "nixpkgs": "nixpkgs_6"
       },
       "locked": {
         "lastModified": 1770433312,
@@ -522,7 +536,7 @@
     },
     "treefmt-nix_2": {
       "inputs": {
-        "nixpkgs": "nixpkgs_3"
+        "nixpkgs": "nixpkgs_4"
       },
       "locked": {
         "lastModified": 1766000401,