Fabric API — [1.21-pre1] Fabric API 0.99.2+1.21

— 1.21-pre1 port (#3811) (modmuss)
— Fix FabricItem.getAttributeModifiers (#3809) (opekope2)
— Improve 24w21b port (#3801) (apple502j)
— No longer allow unused registry ids when syncing. (#3792) (modmuss)