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)