how to remove last category from product in magento 2

$objectManager = \Magento\Framework\App\ObjectManager::getInstance();
$productRepository = $objectManager->get(‘\Magento\Catalog\Model\ProductRepository’);

$sku = 100101;
$product = $productRepository->get(100101);
$categories_from_db_by_product = $product->getCategoryIds();
array_pop($categories_from_db_by_product);
$product->setCategoryIds($categories_from_db_by_product);
$product->save();

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