U-API 2.1.1 for Minecraft 1.21.1

• Made the Sophisticated Backpacks inventory tab equipment-aware: it updates live and is shown only
  for a backpack equipped in the chest armor, Curios or Accessories handlers, ignores backpacks
  carried in the regular inventory, and opens the exact equipped slot through the mod's native request.

Compatibility

• Minecraft: 1.21.1
• Loader: NeoForge
• Java: 21