There's a merged pull request on the void-packages repository

python3-mpd2: update to 3.0.4, fix bum
https://github.com/void-linux/void-packages/pull/31911

Description:
#### General
- [ ] This is a new package and it conforms to the [quality requirements](https://github.com/void-linux/void-packages/blob/master/Manual.md#quality-requirements)

#### Have the results of the proposed changes been tested?
- [x] I use the packages affected by the proposed changes on a regular basis and confirm this PR works for me
- [ ] I generally don't use the affected packages but briefly tested this PR

I tested almost all the dependants:

* sonata 1.7b1 and 1.7.0 - work fine
* mpdevil - works fine
* python3-mpdnotify - works fine
* bum - works with a small patch, then kind of works, but crashes in different places, but that's not related to a python3-mpd2 update
* mpDris2 - crashes for me, apparently that's an upstream bug specific to my configuration, but I think it's safe to assume it works, because alpine packages only one package which depends on python3-mpd2 - mpdris2, so it's probably well tested there. If someone could test this in a non-GNOME environment, that would be nice.