lr: 1.2 -> 1.3 (#38714)

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/ls109sv311n7wqw85kbkqcdwrsqrlca9-lr-1.3/bin/lr -h’ got 0 exit code
- directory tree listing: https://gist.github.com/9c7fdd1add06970cc80d3e523d0f4e02