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

jamulus: update to 3.9.0
https://github.com/void-linux/void-packages/pull/38934

Description:
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#### Testing the changes
- I tested the changes in this PR: **YES**

#### Local build testing
- I built this PR locally for my native architecture, (x86_64-musl)

#### Changes
`qt5-multimedia-devel` should now be explicitly listed in `makedepends`. I've also updated `maintainer` as I no longer use that email / go by that name anymore.