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

mpv-mpris: update to 0.8.1.
https://github.com/void-linux/void-packages/pull/36806

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Having `bash` as a check dependency (both on my machine and in the CI) seems to really mess things up for reasons I don't know of, and running `./xbps-src check mpv-mpris` seems to work without having it there, so I removed it.