fix(nix): update nixpkgs & update pnpm.fetchDeps usage

flake.lock

···
   "nodes": {
     "nixpkgs": {
       "locked": {
-        "lastModified": 1748460289,
-        "narHash": "sha256-7doLyJBzCllvqX4gszYtmZUToxKvMUrg45EUWaUYmBg=",
+        "lastModified": 1753694789,
+        "narHash": "sha256-cKgvtz6fKuK1Xr5LQW/zOUiAC0oSQoA9nOISB0pJZqM=",
         "owner": "nixos",
         "repo": "nixpkgs",
-        "rev": "96ec055edbe5ee227f28cdbc3f1ddf1df5965102",
+        "rev": "dc9637876d0dcc8c9e5e22986b857632effeb727",
         "type": "github"
       },
       "original": {

package.nix

···
 
   pnpmDeps = pnpm.fetchDeps {
     inherit (finalAttrs) pname version src;
-    hash = "sha256-gFTKyJ0ocHMSf3mdDaqkBl6cuo0DmCW8/49/GYZKNKw=";
+    hash = "sha256-+Emp48TfnOOEPBFWbv7ikldEwN+5jQIwryiIs8mmNmM=";
+    fetcherVersion = 2;
   };
 
   buildPhase = ''