Fabric API — [24w38a] Fabric API 0.104.2+1.21.2

— 24w38a (#4101) (modmuss)
— Update Gradle and Mockito (#4093) (modmuss)
— Remove deprecated FRAPI fallback consumers (#4091) (PepperCode1)
— Remove deprecated BlockRenderLayerMap#putItem* (#4090) (PepperCode1)