Fix ae2 stocking bus (#5102)

Author: gustovafing

src/main/java/com/gregtechceu/gtceu/common/cover/detector/MaintenanceDetectorCover.java

@@ -28,7 +28,7 @@ protected void update() {
             return;
         }
 
-        MaintenanceHatchPartMachine maintenance = (MaintenanceHatchPartMachine) coverHolder;
+        MaintenanceHatchPartMachine maintenance = (MaintenanceHatchPartMachine) coverHolder.getHolder();
 
         int signal = getRedstoneSignalOutput();
         boolean shouldSignal = isInverted() != maintenance.hasMaintenanceProblems();

src/main/java/com/gregtechceu/gtceu/integration/ae2/machine/MEStockingBusPartMachine.java

@@ -309,8 +309,8 @@ public ExportOnlyAEStockingItemList(int slots) {
 
         public void setStockingBusPartMachine(@Nullable MEStockingBusPartMachine stockingBusPartMachine) {
             this.stockingBusPartMachine = stockingBusPartMachine;
-            for (var slot : ((ExportOnlyAEStockingItemSlot[]) inventory)) {
-                slot.setStockingBusPartMachine(stockingBusPartMachine);
+            for (var slot : inventory) {
+                ((ExportOnlyAEStockingItemSlot) (slot)).setStockingBusPartMachine(stockingBusPartMachine);
             }
         }