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/a63021a330d8d33d862a8e29924b42d73037dd37' (2022-08-28)
  → 'github:NixOS/nixpkgs/2da64a81275b68fdad38af669afeda43d401e94b' (2022-09-01)

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

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