flake.lock: Update

[typelevel-steward[bot]]

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

Flake lock file updates:

• Updated input 'nixpkgs':
    'github:nixos/nixpkgs/0cd51a933d91078775b300cf0f29aa3495231aa2' (2023-03-26)
  → 'github:nixos/nixpkgs/242246ee1e58f54d2322227fc5eef53b4a616a31' (2023-03-31)

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