drop Recommends: gimp-jxl-plugin, avoid pulling GIMP into WS
    
    It's not a good idea for a library package to Recommend something
    as app-specific as a GIMP plugin. Anything that uses libjxl will
    pull in the whole of GIMP unless soft dependencies are disabled,
    which pulls in Python 2.7 and GTK+ 2. Since aom added a dependency
    on libjxl, this was actually affecting our Workstation image
    composes.