Create/Update assets for version 1.17.1-pre1

data/minecraft/structures/village/savanna/zombie/houses/_list.json

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+{"directories":[],"files":["savanna_animal_pen_2.nbt","savanna_animal_pen_3.nbt","savanna_large_farm_2.nbt","savanna_medium_house_1.nbt","savanna_medium_house_2.nbt","savanna_small_house_1.nbt","savanna_small_house_2.nbt","savanna_small_house_3.nbt","savanna_small_house_4.nbt","savanna_small_house_5.nbt","savanna_small_house_6.nbt","savanna_small_house_7.nbt","savanna_small_house_8.nbt"]}