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/9824557d0d1abe76cfb5df2253181e4a608b3a16' (2024-04-22)
  → 'github:zellij-org/zellij/6f2084025eeba3a10a832fc61a57c40bfdbabb7f' (2024-04-24)

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