update flake inputs

[j-brn]

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

Flake lock file updates:

• Updated input 'nix-std':
    'github:chessai/nix-std/715db541ffff4194620e48d210b76f73a74b5b5d' (2023-12-04)
  → 'github:chessai/nix-std/31bbc925750cc9d8f828fe55cee1a2bd985e0c00' (2024-03-19)
• Updated input 'nixpkgs':
    'github:nixos/nixpkgs/d691274a972b3165335d261cc4671335f5c67de9' (2024-03-14)
  → 'github:nixos/nixpkgs/44d0940ea560dee511026a53f0e2e2cde489b4d4' (2024-03-23)

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