flake: switch to nixpkgs unstable by default

flake.lock

@@ -445,7 +445,7 @@
       "inputs": {
         "hyprland-protocols": "hyprland-protocols",
         "nixpkgs": [
-          "nixpkgs-unstable"
+          "nixpkgs"
         ],
         "wlroots": "wlroots",
         "xdph": "xdph"
@@ -614,21 +614,6 @@
         "type": "github"
       }
     },
-    "nixpkgs-unstable": {
-      "locked": {
-        "lastModified": 1685655444,
-        "narHash": "sha256-6EujQNAeaUkWvpEZZcVF8qSfQrNVWFNNGbUJxv/A5a8=",
-        "owner": "NixOS",
-        "repo": "nixpkgs",
-        "rev": "e635192892f5abbc2289eaac3a73cdb249abaefd",
-        "type": "github"
-      },
-      "original": {
-        "id": "nixpkgs",
-        "ref": "nixos-unstable",
-        "type": "indirect"
-      }
-    },
     "nixpkgs_2": {
       "locked": {
         "lastModified": 1673796341,
@@ -647,16 +632,16 @@
     },
     "nixpkgs_3": {
       "locked": {
-        "lastModified": 1685620773,
-        "narHash": "sha256-iQ+LmporQNdLz8uMJdP62TaAWeLUwl43/MYUBtWqulM=",
+        "lastModified": 1686501370,
+        "narHash": "sha256-G0WuM9fqTPRc2URKP9Lgi5nhZMqsfHGrdEbrLvAPJcg=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "f0ba8235153dd2e25cf06cbf70d43efdd4443592",
+        "rev": "75a5ebf473cd60148ba9aec0d219f72e5cf52519",
         "type": "github"
       },
       "original": {
         "id": "nixpkgs",
-        "ref": "nixos-23.05",
+        "ref": "nixos-unstable",
         "type": "indirect"
       }
     },
@@ -740,7 +725,6 @@
         "nix-software-center": "nix-software-center",
         "nixos-conf-editor": "nixos-conf-editor",
         "nixpkgs": "nixpkgs_3",
-        "nixpkgs-unstable": "nixpkgs-unstable",
         "nur": "nur",
         "plymouth-themes": "plymouth-themes",
         "ranger-icons": "ranger-icons",