systemd/pipewire: stop providing jack-dev

Jane Rachingerrequested to merge
jane400/pipewire into master_staging_systemd

I don't understand why the upstream APKBUILD provides jack-dev with pipewire's pkg{ver,rel}. This blocks users potentially running abuild deps on aports packages, so not a huge loss.

Unblocking BPO with this 🙃

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