AC-11496:Fix for import/export tax rates

Author: Devika-GL

app/code/Magento/TaxImportExport/Controller/Adminhtml/Rate/ExportPost.php

@@ -8,10 +8,12 @@
 
 namespace Magento\TaxImportExport\Controller\Adminhtml\Rate;
 
+use Magento\Framework\App\Action\HttpPostActionInterface;
 use Magento\Framework\App\Filesystem\DirectoryList;
 use Magento\Framework\App\ResponseInterface;
+use Magento\TaxImportExport\Controller\Adminhtml\Rate;
 
-class ExportPost extends \Magento\TaxImportExport\Controller\Adminhtml\Rate
+class ExportPost extends Rate implements HttpPostActionInterface
 {
     /**
      * Export action from import/export tax

app/code/Magento/TaxImportExport/Controller/Adminhtml/Rate/ImportPost.php

@@ -9,8 +9,10 @@
 namespace Magento\TaxImportExport\Controller\Adminhtml\Rate;
 
 use Magento\Framework\Controller\ResultFactory;
+use Magento\Framework\App\Action\HttpPostActionInterface;
+use Magento\TaxImportExport\Controller\Adminhtml\Rate;
 
-class ImportPost extends \Magento\TaxImportExport\Controller\Adminhtml\Rate
+class ImportPost extends Rate implements HttpPostActionInterface
 {
     /**
      * Import action from import/export tax