flake: update the lock (#113)

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

```
Flake lock file updates:

• Updated input 'home-manager':
    'github:nix-community/home-manager/670d9ecc3e46a6e3265c203c2d136031a3d3548e?narHash=sha256-AYCofb8Zu4Mbc1lHDtju/uxeARawRijmOueAqEMEfMU%3D' (2024-04-21)
  → 'github:nix-community/home-manager/bfa7c06436771e3a0c666ccc6ee01e815d4c33aa?narHash=sha256-fv84DCOkBtjF6wMATt0rfovu7e95L8rdEkSfNbwKR3U%3D' (2024-04-23)
• Updated input 'nixpkgs':
    'github:NixOS/nixpkgs/5c24cf2f0a12ad855f444c30b2421d044120c66f?narHash=sha256-XtTSSIB2DA6tOv%2Bl0FhvfDMiyCmhoRbNB%2B0SeInZkbk%3D' (2024-04-19)
  → 'github:NixOS/nixpkgs/6143fc5eeb9c4f00163267708e26191d1e918932?narHash=sha256-%2Bz/XjO3QJs5rLE5UOf015gdVauVRQd2vZtsFkaXBq2Y%3D' (2024-04-21)
• Updated input 'nur':
    'github:nix-community/NUR/2bf689987361a3aded427483cc6cc218eed7ba80?narHash=sha256-F49WRFt%2BkbdaKV%2BdMp1NYfbTcV/nq5QJPfQLP4Ms2Oo%3D' (2024-04-22)
  → 'github:nix-community/NUR/b24ab762a78fcd4b777d0ac95263c73f90af6476?narHash=sha256-Kqj8OrJRKn6hccYFsM2a1Z60oDVsUxyr6bB0FCAry7Q%3D' (2024-04-24)
• Updated input 'sops-nix':
    'github:Mic92/sops-nix/09f1bc8ba3277c0f052f7887ec92721501541938?narHash=sha256-4BvlfPfyUmB1U0r/oOF6jGEW/pG59c5yv6PJwgucTNM%3D' (2024-04-21)
  → 'github:Mic92/sops-nix/f1b0adc27265274e3b0c9b872a8f476a098679bd?narHash=sha256-uIGmA2xq41vVFETCF1WW4fFWFT2tqBln%2BaXnWrvjGRE%3D' (2024-04-23)
```

### 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
```