mopidy-iris: 3.32.5 -> 3.33.0

The removed dependencies were dropped in the following commits:
https://github.com/jaedb/Iris/commit/0c134459ea46799f535a56fb5908629856f2f6e5
https://github.com/jaedb/Iris/commit/4d649809007ab3ac9078af9c5e3022f6fd87eac6
https://github.com/jaedb/Iris/commit/c9861bc79cc65eb7a775fe35eda48d0c8115e9cb

Requests was added in:
https://github.com/jaedb/Iris/commit/28b5f69333f5769e5959df550f04ba6350e3ef9f