chore(etna): disable attic

just unused, adds yet another thing to compile so i don't really see the
point anymore

flake.lock

@@ -51,36 +51,6 @@
         "type": "github"
       }
     },
-    "attic": {
-      "inputs": {
-        "crane": [
-          "crane"
-        ],
-        "flake-compat": [],
-        "flake-utils": [
-          "flake-utils"
-        ],
-        "nixpkgs": [
-          "nixpkgs"
-        ],
-        "nixpkgs-stable": [
-          "nixpkgs"
-        ]
-      },
-      "locked": {
-        "lastModified": 1711742460,
-        "narHash": "sha256-0O4v6e4a1toxXZ2gf5INhg4WPE5C5T+SVvsBt+45Mcc=",
-        "owner": "zhaofengli",
-        "repo": "attic",
-        "rev": "4dbdbee45728d8ce5788db6461aaaa89d98081f0",
-        "type": "github"
-      },
-      "original": {
-        "owner": "zhaofengli",
-        "repo": "attic",
-        "type": "github"
-      }
-    },
     "catppuccin": {
       "locked": {
         "lastModified": 1713552048,
@@ -275,7 +245,6 @@
       "inputs": {
         "agenix": "agenix",
         "api-rs": "api-rs",
-        "attic": "attic",
         "catppuccin": "catppuccin",
         "crane": "crane",
         "deploy-rs": "deploy-rs",