chore(nix): update lockfile

Flake lock file updates:

• Removed input 'flake-compat'
• Removed input 'nix-filter'
• Updated input 'nixpkgs':
    'github:NixOS/nixpkgs/73cf49b8ad837ade2de76f87eb53fc85ed5d4680?narHash=sha256-EO1ygNKZlsAC9avfcwHkKGMsmipUk1Uc0TbrEZpkn64%3D' (2025-02-18)
  → 'github:NixOS/nixpkgs/2631b0b7abcea6e640ce31cd78ea58910d31e650?narHash=sha256-LWqduOgLHCFxiTNYi3Uj5Lgz0SR%2BXhw3kr/3Xd0GPTM%3D' (2025-04-12)

flake.lock

@@ -1,21 +1,5 @@
 {
   "nodes": {
-    "flake-compat": {
-      "flake": false,
-      "locked": {
-        "lastModified": 1733328505,
-        "narHash": "sha256-NeCCThCEP3eCl2l/+27kNNK7QrwZB1IJCrXfrbv5oqU=",
-        "owner": "edolstra",
-        "repo": "flake-compat",
-        "rev": "ff81ac966bb2cae68946d5ed5fc4994f96d0ffec",
-        "type": "github"
-      },
-      "original": {
-        "owner": "edolstra",
-        "repo": "flake-compat",
-        "type": "github"
-      }
-    },
     "libnbtplusplus": {
       "flake": false,
       "locked": {
@@ -32,28 +16,13 @@
         "type": "github"
       }
     },
-    "nix-filter": {
-      "locked": {
-        "lastModified": 1731533336,
-        "narHash": "sha256-oRam5PS1vcrr5UPgALW0eo1m/5/pls27Z/pabHNy2Ms=",
-        "owner": "numtide",
-        "repo": "nix-filter",
-        "rev": "f7653272fd234696ae94229839a99b73c9ab7de0",
-        "type": "github"
-      },
-      "original": {
-        "owner": "numtide",
-        "repo": "nix-filter",
-        "type": "github"
-      }
-    },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1739866667,
+        "lastModified": 1744463964,
-        "narHash": "sha256-EO1ygNKZlsAC9avfcwHkKGMsmipUk1Uc0TbrEZpkn64=",
+        "narHash": "sha256-LWqduOgLHCFxiTNYi3Uj5Lgz0SR+Xhw3kr/3Xd0GPTM=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "73cf49b8ad837ade2de76f87eb53fc85ed5d4680",
+        "rev": "2631b0b7abcea6e640ce31cd78ea58910d31e650",
         "type": "github"
       },
       "original": {
@@ -65,9 +34,7 @@
     },
     "root": {
       "inputs": {
-        "flake-compat": "flake-compat",
         "libnbtplusplus": "libnbtplusplus",
-        "nix-filter": "nix-filter",
         "nixpkgs": "nixpkgs"
       }
     }