flake.lock: Update

Flake lock file updates:

• Updated input 'nixpkgs':
    'https://api.flakehub.com/f/pinned/NixOS/nixpkgs/0.1.840654%2Brev-c2ae88e026f9525daf89587f3cbee584b92b6134/019885a0-3e57-7dd9-84e4-9d98e043e35c/source.tar.gz?narHash=sha256-erbiH2agUTD0Z30xcVSFcDHzkRvkRXOQ3lb887bcVrs%3D' (2025-08-06)
  → 'https://api.flakehub.com/f/pinned/NixOS/nixpkgs/0.1.854036%2Brev-d7600c775f877cd87b4f5a831c28aa94137377aa/0198fc13-c2a8-7fe8-b34c-7e1f9e975869/source.tar.gz?narHash=sha256-tlOn88coG5fzdyqz6R93SQL5Gpq%2Bm/DsWpekNFhqPQk%3D' (2025-08-30)

flake.lock

@@ -2,12 +2,12 @@
   "nodes": {
     "nixpkgs": {
       "locked": {
-        "lastModified": 1754498491,
-        "narHash": "sha256-erbiH2agUTD0Z30xcVSFcDHzkRvkRXOQ3lb887bcVrs=",
-        "rev": "c2ae88e026f9525daf89587f3cbee584b92b6134",
-        "revCount": 840654,
+        "lastModified": 1756542300,
+        "narHash": "sha256-tlOn88coG5fzdyqz6R93SQL5Gpq+m/DsWpekNFhqPQk=",
+        "rev": "d7600c775f877cd87b4f5a831c28aa94137377aa",
+        "revCount": 854036,
         "type": "tarball",
-        "url": "https://api.flakehub.com/f/pinned/NixOS/nixpkgs/0.1.840654%2Brev-c2ae88e026f9525daf89587f3cbee584b92b6134/019885a0-3e57-7dd9-84e4-9d98e043e35c/source.tar.gz"
+        "url": "https://api.flakehub.com/f/pinned/NixOS/nixpkgs/0.1.854036%2Brev-d7600c775f877cd87b4f5a831c28aa94137377aa/0198fc13-c2a8-7fe8-b34c-7e1f9e975869/source.tar.gz"
       },
       "original": {
         "type": "tarball",