lr: 1.3 -> 1.4

Semi-automatic update generated by https://github.com/ryantm/nixpkgs-update tools.

This update was made based on information from https://repology.org/metapackage/lr/versions.

These checks were done:

- built on NixOS
- ran ‘/nix/store/cwrqw239bf9kd1d82ljq7506j4ri4p8i-lr-1.4/bin/lr -h’ got 0 exit code
- directory tree listing: https://gist.github.com/7ffd474460d7e46863b9b0cf42f9c791