ISTWCMS-4535 Change buildXPathQuery() to assertSession()->buildXPathQuery()

Change record:
https://www.drupal.org/node/3129738

tests/src/Functional/UwWcmsBasicTest.php

@@ -1542,7 +1542,7 @@ class UwWcmsBasicTest extends BrowserTestBase {
    */
   private function dashboardTest() {
     // Used by dropbutton test.
-    $layout_link_xpath = $this->buildXPathQuery('//ul[@class=:class]/li/a[contains(@href, :href)]', [
+    $layout_link_xpath = $this->assertSession()->buildXPathQuery('//ul[@class=:class]/li/a[contains(@href, :href)]', [
       ':class' => 'dropbutton',
       ':href' => '/home/layout',
     ]);