flake.lock: update zellij

[a-kenji-buildbot]

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

Flake lock file updates:

• Updated input 'zellij':
    'github:zellij-org/zellij/07dddc60fc1ba5fb29a5f0b6331f381990a8420d' (2024-04-16)
  → 'github:zellij-org/zellij/162a6dd93dc6c4d4d9a7eb1a7765623bc117e8f4' (2024-04-19)

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