mopidy-iris: 3.17.1 -> 3.17.5

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

This update was made based on information from https://repology.org/metapackage/Mopidy-Iris/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 3.17.5 with grep in /nix/store/ih97pncwmlk71wa9cv49aa9hx7mxc156-Mopidy-Iris-3.17.5
- directory tree listing: https://gist.github.com/0f0187f3e9d60193ebddabe0b082e78f