Apply fixes from StyleCI

Author: StyleCIBot

packages/framework/tests/Feature/SitemapFeatureTest.php

@@ -26,7 +26,7 @@ public function testTheSitemapFeature()
     protected function setUpBroadSiteStructure(): void
     {
         $this->file('_pages/about.md', "# About\n\nThis is the about page.");
-        $this->file('_pages/contact.html', "<h1>Contact</h1><p>This is the contact page.</p>");
+        $this->file('_pages/contact.html', '<h1>Contact</h1><p>This is the contact page.</p>');
         $this->file('_posts/hello-world.md', "# Hello, World!\n\nThis is the first post.");
         $this->file('_posts/second-post.md', "# Second Post\n\nThis is the second post.");
         $this->file('_docs/index.md', "# Documentation\n\nThis is the documentation index.");