MAGETWO-86299: [Backport to 2.3-develop] Fix #9243 - Upgrade ZF components. Zend_Service #12957

 - Merge Pull Request #12957 from dverkade/magento2:2.3-Upgrade-ZF-components.-Zend_Service
 - Merged commits:
   1. 68389d6

Author: ishakhsuvarov

lib/internal/Magento/Framework/CurrencyInterface.php

@@ -239,15 +239,19 @@ public function isLess($value, $currency = null);
     /**
      * Returns the set service class
      *
-     * @return \Zend_Service
+     * @return \Zend_Currency_CurrencyInterface
+     * @deprecated
+     * @see \Magento\Directory\Model\Currency\Import\ImportInterface
      */
     public function getService();
 
     /**
      * Sets a new exchange service
      *
-     * @param string|\Magento\Framework\Locale\CurrencyInterface $service Service class
-     * @return \Magento\Framework\CurrencyInterface
+     * @param string|\Zend_Currency_CurrencyInterface $service Service class
+     * @return \Zend_Currency_CurrencyInterface
+     * @deprecated
+     * @see \Magento\Directory\Model\Currency\Import\ImportInterface
      */
     public function setService($service);
 }