MC-29549: Update Symfony components to 4.4LTS for 2.3.x

Author: fascinosum

dev/tests/integration/testsuite/Magento/Csp/Model/Policy/Renderer/SimplePolicyHeaderRendererTest.php

@@ -11,7 +11,6 @@
 use Magento\TestFramework\Helper\Bootstrap;
 use PHPUnit\Framework\TestCase;
 use Magento\Framework\App\Response\Http as HttpResponse;
-use Zend\Http\Header\HeaderInterface;
 
 /**
  * Test that rendering policies via headers works.

dev/tests/integration/testsuite/Magento/Framework/App/Response/HeaderProvider/AbstractHeaderTestCase.php

@@ -43,7 +43,6 @@ public function setUp()
      */
     protected function assertHeaderPresent($name, $value)
     {
-        $value = [$value];
         $this->interceptedResponse->sendResponse();
         $header = $this->interceptedResponse->getHeader($name);
 
@@ -57,7 +56,7 @@ protected function assertHeaderPresent($name, $value)
         }
 
         $this->assertSame(
-            $value,
+            [$value],
             $headerContent
         );
     }