phpstan fixes

Author: AydinHassan

src/Builder/CliMenuBuilder.php

@@ -270,7 +270,7 @@ private function processSplitItemShortcuts(SplitItem $splitItem) : void
                 $current = $splitItem->getSelectedItemIndex();
 
                 $splitItem->setSelectedItemIndex(
-                    array_search($item, $splitItem->getItems(), true)
+                    (int) array_search($item, $splitItem->getItems(), true)
                 );
 
                 $menu->executeAsSelected($splitItem);

src/CliMenu.php

@@ -415,7 +415,7 @@ public function setSelectedItem(MenuItemInterface $item) : void
             throw new \InvalidArgumentException('Item does not exist in menu');
         }
 
-        $this->selectedItem = $key;
+        $this->selectedItem = (int) $key;
     }
 
     public function getSelectedItemIndex() : int