Add loading="lazy" to image_with_borders.phtml

Author: Timon de Groot

app/code/Magento/Catalog/view/frontend/templates/product/image_with_borders.phtml

@@ -16,6 +16,7 @@
         <img class="<?= $escaper->escapeHtmlAttr($block->getClass()) ?>"
              <?= $escaper->escapeHtmlAttr($block->getCustomAttributes()) ?>
              src="<?= $escaper->escapeUrl($block->getImageUrl()) ?>"
+             loading="lazy"
              max-width="<?= $escaper->escapeHtmlAttr($block->getWidth()) ?>"
              max-height="<?= $escaper->escapeHtmlAttr($block->getHeight()) ?>"
              alt="<?= /* @noEscape */ $block->stripTags($block->getLabel(), null, true) ?>"/></span>