Fabric API — [1.21.3] Fabric API 0.109.0+1.21.3

— Bump version (modmuss50)
— Provide a RegistryByteBuf for attachment syncing (#4223) (modmuss)
— Fix client test random crashes (#4224) (modmuss)
— Change outdated setPredicate to addPredicate. (#4234) (fishshi)