Create/Update assets for version 1.21-pre3

data/minecraft/structure/village/desert/zombie/houses/_list.json

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+{"directories":[],"files":["desert_medium_house_1.nbt","desert_medium_house_2.nbt","desert_small_house_1.nbt","desert_small_house_2.nbt","desert_small_house_3.nbt","desert_small_house_4.nbt","desert_small_house_5.nbt","desert_small_house_6.nbt","desert_small_house_7.nbt","desert_small_house_8.nbt"]}