Update Nix flake (#36857)

Automated changes by the
[update-flake-lock](https://github.com/DeterminateSystems/update-flake-lock)
GitHub Action.

```
Flake lock file updates:

• Updated input 'nixpkgs':
    'github:nixos/nixpkgs/dd9b079' (2026-02-27)
  → 'github:nixos/nixpkgs/aca4d95' (2026-03-06)
```

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flake.lock

@@ -2,11 +2,11 @@
   "nodes": {
     "nixpkgs": {
       "locked": {
-        "lastModified": 1772198003,
-        "narHash": "sha256-I45esRSssFtJ8p/gLHUZ1OUaaTaVLluNkABkk6arQwE=",
+        "lastModified": 1772773019,
+        "narHash": "sha256-E1bxHxNKfDoQUuvriG71+f+s/NT0qWkImXsYZNFFfCs=",
         "owner": "nixos",
         "repo": "nixpkgs",
-        "rev": "dd9b079222d43e1943b6ebd802f04fd959dc8e61",
+        "rev": "aca4d95fce4914b3892661bcb80b8087293536c6",
         "type": "github"
       },
       "original": {