DefaultCaptcha.php

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<?php
namespace Magento\Captcha\Block\Adminhtml\Captcha;

class DefaultCaptcha extends \Magento\Captcha\Block\Captcha\DefaultCaptcha
{
    protected $_url;

    protected $_config;

    public function __construct(
        \Magento\Framework\View\Element\Template\Context $context,
        \Magento\Captcha\Helper\Data $captchaData,
        \Magento\Backend\Model\UrlInterface $url,
        \Magento\Backend\App\ConfigInterface $config,
        array $data = []
    ) {
        parent::__construct($context, $captchaData, $data);
        $this->_url = $url;
        $this->_config = $config;
    }

    public function getRefreshUrl()
    {
        return $this->_url->getUrl(
            'adminhtml/refresh/refresh',
            ['_secure' => $this->_config->isSetFlag('web/secure/use_in_adminhtml'), '_nosecret' => true]
        );
    }
}