walkers 6.1

• fix Parrots get poison when eating cookies
• fix maxAmorToughness config option
• improve hitbox handling, handle scale attribute
• scale step height
• add CantFreeze trait
• add support for various minecraft entity type tags
• remove jump boost for slimes
• add AlexsCaves mobs to flying.json
• fix polar bear left arm
• support 1.21.4