working rust package override

plus flake update :P

flake.lock

@@ -64,11 +64,11 @@
         "zon2nix": "zon2nix"
       },
       "locked": {
-        "lastModified": 1760808459,
-        "narHash": "sha256-+3ups2SbJ2y2CknaoC8P4IphJDWG/yo5loW01BF7STw=",
+        "lastModified": 1761172581,
+        "narHash": "sha256-uX8FzMlRt15kvs4pPuOHZeQe1wztQXTEWOVtB2EwmB0=",
         "owner": "ghostty-org",
         "repo": "ghostty",
-        "rev": "be0da4845cb629bcf1f5f1890a28850bb7adfe16",
+        "rev": "bdbda2fd8380b440508246bcda0bf1198f6666e4",
         "type": "github"
       },
       "original": {
@@ -142,11 +142,11 @@
     },
     "nixpkgs_3": {
       "locked": {
-        "lastModified": 1760580664,
-        "narHash": "sha256-/YdfibIrnqXAL8p5kqCU345mzpHoOtuVIkMiI2pF4Dc=",
+        "lastModified": 1761016216,
+        "narHash": "sha256-G/iC4t/9j/52i/nm+0/4ybBmAF4hzR8CNHC75qEhjHo=",
         "owner": "nixos",
         "repo": "nixpkgs",
-        "rev": "98ff3f9af2684f6136c24beef08f5e2033fc5389",
+        "rev": "481cf557888e05d3128a76f14c76397b7d7cc869",
         "type": "github"
       },
       "original": {
@@ -156,13 +156,48 @@
         "type": "github"
       }
     },
+    "nixpkgs_4": {
+      "locked": {
+        "lastModified": 1744536153,
+        "narHash": "sha256-awS2zRgF4uTwrOKwwiJcByDzDOdo3Q1rPZbiHQg/N38=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "18dd725c29603f582cf1900e0d25f9f1063dbf11",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixpkgs-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
     "root": {
       "inputs": {
         "darwin": "darwin",
         "ghostty": "ghostty",
         "home-manager": "home-manager",
         "nix-flatpak": "nix-flatpak",
-        "nixpkgs": "nixpkgs_3"
+        "nixpkgs": "nixpkgs_3",
+        "rust-overlay": "rust-overlay"
+      }
+    },
+    "rust-overlay": {
+      "inputs": {
+        "nixpkgs": "nixpkgs_4"
+      },
+      "locked": {
+        "lastModified": 1761100675,
+        "narHash": "sha256-LX3TCDBeNpCWTDXtGyRASVcLmRPChSli34bgHnZ1DCw=",
+        "owner": "oxalica",
+        "repo": "rust-overlay",
+        "rev": "72161c6c53f6e3f8dadaf54b2204a5094c6a16ae",
+        "type": "github"
+      },
+      "original": {
+        "owner": "oxalica",
+        "repo": "rust-overlay",
+        "type": "github"
       }
     },
     "systems": {