Download Backpacked for Minecraft 1.21.1

✨ Add config option to set the amount of initially unlocked inventory and eqiupable slots
📦 First nine inventory slots will be unlocked by default (can be changed in config)
📦 Rebalanced inventory unlock costs. Delete backpacked.backpack.toml or remove [inventory.slots.unlockCost] section to correctly update.
📦 Rebalanced equipable unlock costs. Delete backpacked.backpack.toml or remove [equipable.unlockCost] section to correctly update.
🧾 Add uk_ua lang support (Thanks veydzh3r)
🐛 Fixed "backpacked:expression" value type always returning zero