fix: ensure cue configs sort their fields

It seems to be now necessary to tell cue to sort fields to ensure stable ordering, in older versions that might have just worked per default.

See:

• https://github.com/cue-lang/cue/blob/master/cmd/cue/cmd/testdata/script/sortfields.txtar
• https://github.com/cue-lang/cue/issues/4042