libre: 0.5.7 -> 0.5.8

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

This update was made based on information from https://repology.org/metapackage/libre/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 0.5.8 with grep in /nix/store/rqyqr2gb6pxqqah435xznnqwr9zi0xi2-libre-0.5.8
- directory tree listing: https://gist.github.com/a84247052706f314827aca34a1869d10