Create/Update assets for version 1.20

data/minecraft/structures/ancient_city/walls/_list.json

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+{"directories":[],"files":["intact_corner_wall_1.nbt","intact_horizontal_wall_1.nbt","intact_horizontal_wall_2.nbt","intact_horizontal_wall_bridge.nbt","intact_horizontal_wall_passage_1.nbt","intact_horizontal_wall_stairs_1.nbt","intact_horizontal_wall_stairs_2.nbt","intact_horizontal_wall_stairs_3.nbt","intact_horizontal_wall_stairs_4.nbt","intact_intersection_wall_1.nbt","intact_lshape_wall_1.nbt","ruined_corner_wall_1.nbt","ruined_corner_wall_2.nbt","ruined_horizontal_wall_stairs_1.nbt","ruined_horizontal_wall_stairs_2.nbt","ruined_horizontal_wall_stairs_3.nbt","ruined_horizontal_wall_stairs_4.nbt"]}