update flakes to fix tests on macos

flake.lock

@@ -42,11 +42,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1701847270,
-        "narHash": "sha256-ttPWHy1NZwJzSzY7OmofFNyrm9kWc+RFFHpJGeQ4kWw=",
+        "lastModified": 1702192996,
+        "narHash": "sha256-taRtgPtpYl7KofdDC9sDHe1urV3+pP2JFwuAyVlccYI=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "9ed8ade77aef706a03d8cc3a5ad4f60848ac59a7",
+        "rev": "db3bd72ed27a5b2b96c3e6cca463117d27bb052b",
         "type": "github"
       },
       "original": {
@@ -71,11 +71,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1701682826,
-        "narHash": "sha256-2lxeTUGs8Jzz/wjLgWYmZoXn60BYNRMzwHFtxNFUDLU=",
+        "lastModified": 1701958734,
+        "narHash": "sha256-3h3EH1FXQkIeAuzaWB+nK0XK54uSD46pp+dMD3gAcB4=",
         "owner": "numtide",
         "repo": "treefmt-nix",
-        "rev": "affe7fc3f5790e1d0b5ba51bcff0f7ebe465e92d",
+        "rev": "e8cea581dd2b7c9998c1e6662db2c1dc30e7fdb0",
         "type": "github"
       },
       "original": {

tests/assets/flake.lock

@@ -2,15 +2,16 @@
   "nodes": {
     "nixpkgs": {
       "locked": {
-        "lastModified": 1616345250,
-        "narHash": "sha256-WLbLFIJyKCklGyEMGwh9XDTzafafyO95s4+rJHOc/Ag=",
+        "lastModified": 1702172177,
+        "narHash": "sha256-2T1DjuXz0bVxy5g8oF9FYioHOLWkXw5EdW687NDQakE=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "5e4a4e0c32f0ca0a5bd4ebbbf17aedd347de7f3e",
+        "rev": "2873a73123077953f3e6f34964466018876d87c4",
         "type": "github"
       },
       "original": {
         "owner": "NixOS",
+        "ref": "nixpkgs-unstable",
         "repo": "nixpkgs",
         "type": "github"
       }

tests/assets/flake.nix

@@ -1,5 +1,5 @@
 {
-  inputs.nixpkgs.url = "github:NixOS/nixpkgs";
+  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
 
   outputs = { nixpkgs, ... }:
     let