PR-34061 updated binding to text

Author: engcom-Bravo

app/code/Magento/Theme/view/frontend/templates/html/header.phtml

@@ -19,7 +19,7 @@ $welcomeMessage = $block->getWelcome();
         <!-- /ko -->
         <!-- ko ifnot: customer().fullname  -->
         <span class="not-logged-in"
-              data-bind='html: "<?= $escaper->escapeHtmlAttr($welcomeMessage) ?>"'></span>
+              data-bind='text: "<?= $escaper->escapeHtml($welcomeMessage) ?>"'></span>
         <?= $block->getBlockHtml('header.additional') ?>
         <!-- /ko -->
     </li>