netherite helmets on zombies/skellies shouldn't lose durability in sunlight

context and reasoning

• undead are burnt by sunlight, unless wearing helmets
• helmets lose durability while shielding them from sunlight
• I consider this durability loss to be fire-type as without them they'd burn
• .
• netherite armor doesn't lose durability from fire-type effects including lava
• therefore netherite helmets should not lose durability when shielding undead from sunlight

I don't know if this is a change in helmets (items) or a change in mobs, so I put this post under Humanoids as undead are humanoids and this is more about them