automated: Update flake.lock

- The following Nix Flake inputs were updated:

```
• Updated input 'nixpkgs':
    'github:NixOS/nixpkgs/a84ebe20c6bc2ecbcfb000a50776219f48d134cc?narHash=sha256-mNqIplmEohk5jRkqYqG19GA8MbQ/D4gQSK0Mu4LvfRQ%3D' (2025-03-19)
  → 'github:NixOS/nixpkgs/f675531bc7e6657c10a18b565cfebd8aa9e24c14?narHash=sha256-gbl9hE39nQRpZaLjhWKmEu5ejtQsgI5TWYrIVVJn30U%3D' (2025-04-09)
```

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": 1742422364,
+        "lastModified": 1744232761,
-        "narHash": "sha256-mNqIplmEohk5jRkqYqG19GA8MbQ/D4gQSK0Mu4LvfRQ=",
+        "narHash": "sha256-gbl9hE39nQRpZaLjhWKmEu5ejtQsgI5TWYrIVVJn30U=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "a84ebe20c6bc2ecbcfb000a50776219f48d134cc",
+        "rev": "f675531bc7e6657c10a18b565cfebd8aa9e24c14",
         "type": "github"
       },
       "original": {