UpdateItemQty.php

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<?php
namespace Magento\Checkout\Controller\Sidebar;

use Magento\Checkout\Model\Sidebar;
use Magento\Framework\App\Action\Action;
use Magento\Framework\App\Action\Context;
use Magento\Framework\App\Response\Http;
use Magento\Framework\Exception\LocalizedException;
use Magento\Framework\Json\Helper\Data;
use Psr\Log\LoggerInterface;

class UpdateItemQty extends Action
{
    protected $sidebar;

    protected $logger;

    protected $jsonHelper;

    public function __construct(
        Context $context,
        Sidebar $sidebar,
        LoggerInterface $logger,
        Data $jsonHelper
    ) {
        $this->sidebar = $sidebar;
        $this->logger = $logger;
        $this->jsonHelper = $jsonHelper;
        parent::__construct($context);
    }

    public function execute()
    {
        $itemId = (int)$this->getRequest()->getParam('item_id');
        $itemQty = $this->getRequest()->getParam('item_qty') * 1;

        try {
            $this->sidebar->checkQuoteItem($itemId);
            $this->sidebar->updateQuoteItem($itemId, $itemQty);
            return $this->jsonResponse();
        } catch (LocalizedException $e) {
            return $this->jsonResponse($e->getMessage());
        } catch (\Exception $e) {
            $this->logger->critical($e);
            return $this->jsonResponse($e->getMessage());
        }
    }

    protected function jsonResponse($error = '')
    {
        return $this->getResponse()->representJson(
            $this->jsonHelper->jsonEncode($this->sidebar->getResponseData($error))
        );
    }
}