libdvdnav: 5.0.3 -> 6.0.0

Semi-automatic update generated by ryantm/nix-update tools. These checks were done:

- built on NixOS
/tmp/tmp.5t3QSH6Esb /home/ryantm/.cache/nixpkgs
/home/ryantm/.cache/nixpkgs
- 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 6.0.0 with grep in /nix/store/9hclm5126babak424wlc0bflzp5w8wxg-libdvdnav-6.0.0
- directory tree listing: gist.github.com/ac1677320d622ed0b03422144cbbc5e4