nix: fix nixpkgs version

flake.lock

@@ -17,15 +17,16 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1670952872,
-        "narHash": "sha256-tmhCNibwoviM+BHXBWUxO+XtAwbO84b2BHC4PrD7FrQ=",
+        "lastModified": 1669833724,
+        "narHash": "sha256-/HEZNyGbnQecrgJnfE8d0WC5c1xuPSD2LUpB6YXlg4c=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "16875b3e7be8380c29af192cc8ff1debae6d311a",
+        "rev": "4d2b37a84fad1091b9de401eb450aae66f1a741e",
         "type": "github"
       },
       "original": {
         "owner": "NixOS",
+        "ref": "22.11",
         "repo": "nixpkgs",
         "type": "github"
       }

flake.nix

 {
   inputs = {
-    nixpkgs.url = "github:NixOS/nixpkgs?tag=22.11";
+    nixpkgs.url = "github:NixOS/nixpkgs?ref=22.11";
     flake-utils.url = "github:numtide/flake-utils";
   };