pipewire-jack takes precedence over jack

Since commit c64c88a4, pipewire-jack will take precedence over jack by default. Excerpt from an upgrade log on one of my Edge systems:

(29/38) Purging jack (1.9.19-r0)
(30/38) Installing pipewire-libs (0.3.39-r6)
(31/38) Installing pipewire-media-session (0.4.0-r2)
(32/38) Installing pipewire-media-session-doc (0.4.0-r2)
(33/38) Installing pipewire-jack (0.3.39-r6)

As such, this will accidentally purge jack on upgrade and replace it with pipewire-jack instead which is IMHO not desired. This was briefly discussed on #alpine-devel a few days ago, pipewire-jack probably needs a $provider_priority to avoid this. Just creating this tracking issue to ensure that this is fixed before 3.15 is tagged.

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