use portunus from nixos-unstable

flake.lock

@@ -190,6 +190,22 @@
         "type": "github"
       }
     },
+    "nixpkgs-unstable": {
+      "locked": {
+        "lastModified": 1709479366,
+        "narHash": "sha256-n6F0n8UV6lnTZbYPl1A9q1BS0p4hduAv1mGAP17CVd0=",
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "rev": "b8697e57f10292a6165a20f03d2f42920dfaf973",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nixos",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
     "nixpkgs_2": {
       "locked": {
         "lastModified": 1682134069,
@@ -256,6 +272,7 @@
         "kpp": "kpp",
         "nix-index-database": "nix-index-database",
         "nixpkgs": "nixpkgs",
+        "nixpkgs-unstable": "nixpkgs-unstable",
         "print-interface": "print-interface",
         "sops-nix": "sops-nix",
         "vscode-server": "vscode-server"