flake.lock: Update

[github-actions[bot]]

Automated changes by the update-flake-lock GitHub Action.

Flake lock file updates:

• Updated input 'nixpkgs':
    'github:nixos/nixpkgs/8351f271f85dae1ee28269028acde661e60394dd' (2022-12-24)
  → 'github:nixos/nixpkgs/293a28df6d7ff3dec1e61e37cc4ee6e6c0fb0847' (2022-12-30)

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:

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