libdvdcss: 1.4.1 -> 1.4.2

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

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

These checks were done:

- built on NixOS
- Warning: no binary found that responded to help or version flags. (This warning appears even if the package isn't expected to have binaries.)
- found 1.4.2 with grep in /nix/store/4fb959a9v1a5nv65smypcp3vxk3j1jhl-libdvdcss-1.4.2
- directory tree listing: https://gist.github.com/8d034c11cb818a43ba4b289989a957a3