Fix integration tests error:

Magento\Framework\Image\Adapter\InterfaceTest::testCreatePngFromString with data set #1 (array(5, 12), array(0, 0, 0), array(0, 20), array(255, 255, 255), 'IMAGEMAGICK')
PHPUnit\Framework\Exception: Deprecated: Implicit conversion from float 11.34375 to int loses precision in /var/www/html/lib/internal/Magento/Framework/Image/Adapter/ImageMagick.php:505.

Author: vpodorozh

lib/internal/Magento/Framework/Image/Adapter/ImageMagick.php

@@ -502,7 +502,7 @@ public function createPngFromString($text, $font = '')
         $draw->annotation(0, $metrics['ascender'], $text);
 
         $height = abs($metrics['ascender']) + abs($metrics['descender']);
-        $image->newImage($metrics['textWidth'], $height, $background);
+        $image->newImage($metrics['textWidth'], (int) $height, $background);
         $this->_fileType = IMAGETYPE_PNG;
         $image->setImageFormat('png');
         $image->drawImage($draw);