Temporarily switch to staging-next

The macOS SDK rewrite has fixed many issues, but things are still quite unstable under Darwin. As we'd prefer to have newer features sooner, let's temporarily switch to `staging-next`.

flake.lock

@@ -127,11 +127,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1730980823,
-        "narHash": "sha256-nUSlnYSeg4N18LByLw8luEvrV+8Hwgddh9Bp13mo3wA=",
+        "lastModified": 1731153869,
+        "narHash": "sha256-3Ftf9oqOypcEyyrWJ0baVkRpvQqroK/SVBFLvU3nPuc=",
         "owner": "LnL7",
         "repo": "nix-darwin",
-        "rev": "fa7b46fa7716d0ff1abaa59ee2472ab25ad07188",
+        "rev": "5c74ab862c8070cbf6400128a1b56abb213656da",
         "type": "github"
       },
       "original": {
@@ -142,16 +142,16 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1730785428,
-        "narHash": "sha256-Zwl8YgTVJTEum+L+0zVAWvXAGbWAuXHax3KzuejaDyo=",
+        "lastModified": 1731218669,
+        "narHash": "sha256-o15ff4QMY+w8Ny74nIp348MHN1l6FvssPMnJm3uwhC0=",
         "owner": "nixos",
         "repo": "nixpkgs",
-        "rev": "4aa36568d413aca0ea84a1684d2d46f55dbabad7",
+        "rev": "24e5e7f5fcae6b6950da223e44bc6dda4613ea1a",
         "type": "github"
       },
       "original": {
         "owner": "nixos",
-        "ref": "nixos-unstable",
+        "ref": "staging-next",
         "repo": "nixpkgs",
         "type": "github"
       }

flake.nix

@@ -3,7 +3,7 @@
 
   inputs = {
     # Specify the source of Home Manager and Nixpkgs.
-    nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
+    nixpkgs.url = "github:nixos/nixpkgs/staging-next";
     apple-silicon-support = {
       url = "github:zzywysm/nixos-asahi";
       inputs.nixpkgs.follows = "nixpkgs";