jackett: 0.8.886 -> 0.8.929

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

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

These checks were done:

- built on NixOS
- ran ‘/nix/store/5zfami4c97mdgiw2kga88hbr050gz9nl-jackett-0.8.929/bin/Jackett -h’ got 0 exit code
- ran ‘/nix/store/5zfami4c97mdgiw2kga88hbr050gz9nl-jackett-0.8.929/bin/Jackett help’ got 0 exit code
- found 0.8.929 with grep in /nix/store/5zfami4c97mdgiw2kga88hbr050gz9nl-jackett-0.8.929
- directory tree listing: https://gist.github.com/abeee550859eff26afc80fcec3b0ec15