flake.lock: Update (#206)

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/9df3e30ce24fd28c7b3e2de0d986769db5d6225d' (2024-03-06)
  → 'github:nixos/nixpkgs/3030f185ba6a4bf4f18b87f345f104e6a6961f34' (2024-03-09)
• Updated input 'sops-nix':
    'github:Mic92/sops-nix/25dd60fdd08fcacee2567a26ba6b91fe098941dc' (2024-03-06)
  → 'github:Mic92/sops-nix/f8d5c8baa83fe620a28c0db633be9db3e34474b4' (2024-03-10)
• Updated input 'sops-nix/nixpkgs':
    'github:NixOS/nixpkgs/458b097d81f90275b3fdf03796f0563844926708' (2024-03-02)
  → 'github:NixOS/nixpkgs/0e7f98a5f30166cbed344569426850b21e4091d4' (2024-03-09)
• Updated input 'sops-nix/nixpkgs-stable':
    'github:NixOS/nixpkgs/66d65cb00b82ffa04ee03347595aa20e41fe3555' (2024-03-03)
  → 'github:NixOS/nixpkgs/b17375d3bb7c79ffc52f3538028b2ec06eb79ef8' (2024-03-10)
```

### Running GitHub Actions on this PR

GitHub Actions will not run workflows on pull requests which are opened
by a GitHub Action.

To run GitHub Actions workflows on this PR, run:

```sh
git branch -D update_flake_lock_action
git fetch origin
git checkout update_flake_lock_action
git commit --amend --no-edit
git push origin update_flake_lock_action --force
```

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