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

New package: jellyfin-10.7.6
https://github.com/void-linux/void-packages/pull/32802

Description:
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#### General
- [x] 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

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Continuation of https://github.com/void-linux/void-packages/pull/20414 with some clean-up and version bumps. I also added `/etc/default/jellyfin` and `/etc/sv/jellyfin` meaning this is functionally complete and I am using it on my system.