Update thumbnail.html

Author: in-session

app/code/Magento/Checkout/view/frontend/web/template/summary/item/details/thumbnail.html

@@ -8,6 +8,6 @@
       data-bind="attr: {'style': 'height: ' + getHeight($parents[1])/2 + 'px; width: ' + getWidth($parents[1])/2 + 'px;' }">
     <span class="product-image-wrapper">
         <img
-            data-bind="attr: {'src': getSrc($parents[1]), 'width': getWidth($parents[1]), 'height': getHeight($parents[1]), 'alt': getAlt($parents[1]), 'title': getAlt($parents[1]) }"/>
+            data-bind="attr: {'src': getSrc($parents[1]), 'width': getWidth($parents[1]), 'height': getHeight($parents[1]), 'alt': getAlt($parents[1]), 'title': getAlt($parents[1]) }" loading="lazy"/>
     </span>
 </span>