flake.lock: Update (#306)

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

```
Flake lock file updates:

• Updated input 'flake-utils':
    'github:numtide/flake-utils/b1d9ab70662946ef0850d488da1c9019f3a9752a?narHash=sha256-SZ5L6eA7HJ/nmkzGG7/ISclqe6oZdOZTNoesiInkXPQ%3D' (2024-03-11)
  → 'github:numtide/flake-utils/c1dfcf08411b08f6b8615f7d8971a2bfa81d5e8a?narHash=sha256-X6rJYSESBVr3hBoH0WbKE5KvhPU5bloyZ2L4K60/fPQ%3D' (2024-09-17)
• Updated input 'nixpkgs':
    'github:nixos/nixpkgs/345c263f2f53a3710abe117f28a5cb86d0ba4059?narHash=sha256-sjiGsMh%2B1cWXb53Tecsm4skyFNag33GPbVgCdfj3n9I%3D' (2024-09-13)
  → 'github:nixos/nixpkgs/06cf0e1da4208d3766d898b7fdab6513366d45b9?narHash=sha256-S5kVU7U82LfpEukbn/ihcyNt2%2BEvG7Z5unsKW9H/yFA%3D' (2024-09-29)
```

### 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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