automated: Update flake.lock

- The following Nix Flake inputs were updated:

```
• Updated input 'nixpkgs':
    'github:NixOS/nixpkgs/b024ced1aac25639f8ca8fdfc2f8c4fbd66c48ef?narHash=sha256-fusHbZCyv126cyArUwwKrLdCkgVAIaa/fQJYFlCEqiU%3D' (2025-04-17)
  → 'github:NixOS/nixpkgs/8a2f738d9d1f1d986b5a4cd2fd2061a7127237d7?narHash=sha256-sPwcCYuiEopaafePqlG826tBhctuJsLx/mhKKM5Fmjo%3D' (2025-04-23)
```

Auto-generated by [update.yml][1] with the help of
[create-pull-request][2].

[1]: https://forgejo.stefka.eu/jiriks74/nix.nvim/src/branch/main/.github/workflows/update.yml
[2]: https://forgejo.stefka.eu/jiriks74/create-pull-request

flake.lock

@@ -181,11 +181,11 @@
     },
     "nixpkgs_2": {
       "locked": {
-        "lastModified": 1744932701,
+        "lastModified": 1745391562,
-        "narHash": "sha256-fusHbZCyv126cyArUwwKrLdCkgVAIaa/fQJYFlCEqiU=",
+        "narHash": "sha256-sPwcCYuiEopaafePqlG826tBhctuJsLx/mhKKM5Fmjo=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "b024ced1aac25639f8ca8fdfc2f8c4fbd66c48ef",
+        "rev": "8a2f738d9d1f1d986b5a4cd2fd2061a7127237d7",
         "type": "github"
       },
       "original": {