emby: 3.3.0.0 -> 3.3.1.0

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

This update was made based on information from https://repology.org/metapackage/emby/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 3.3.1.0 with grep in /nix/store/b5qx498y0lan20ran7ci7wdhlisvy1jd-emby-3.3.1.0
- directory tree listing: https://gist.github.com/eb93cdffbfae9ffe18d439df893237d8