Nothing! Really no need to lubricate this point at all. Carefully tighten to the recommended spec and that's it. Anything you put there is almost inevitably going to leach out onto the brake surface and contaminate the brake pads.
This is the sort of thing you want to stay tight. On brake disc bolts, Loctite is used. Not sure that a large thread like a rotor nut would need thread lock but I’ve also never used a grease and never had a problem removing them. That’s on MTB wheels that see all weathers.
I work on these daily, the factory build the bikes with this assembly dry, I’ve never seen one seize in use and I always assemble them dry when servicing them.
[suspicious squint] I guess I'm used to equipment where no threaded parts are assembled without antiseize, grease, or threadlocker. Bare (well, anodized) aluminum on aluminum would be a serious mistake in most applications.
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