GNOME 46 backgrounds require `libjxl-pixbuf-loader`

Package Information

Package name: libjxl-pixbuf-loader
Package version: 0.9.1-r0
Alpine version: 3.20.0_alpha20240315
Alpine architecture: x86_64

Summary

The new GNOME 46 gnome-backgrounds package ships many wallpapers in JXL format. This includes the default wallpaper. However, the package libjxl-pixbuf-loader required for loading these files is missing as dependency of gnome-backgrounds.

This is a followup to #15863 (closed)

cc @andypost

Steps to reproduce

If applicable, please provide instructions to reproduce the issue.

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