Fix various compatibility issues with PHP 8

libs/swiftmailer/classes/Swift/NullTransport.php

@@ -0,0 +1,36 @@
+<?php
+
+/*
+ * This file is part of SwiftMailer.
+ * (c) 2009 Fabien Potencier <fabien.potencier@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Pretends messages have been sent, but just ignores them.
+ *
+ * @author Fabien Potencier
+ */
+class Swift_NullTransport extends Swift_Transport_NullTransport
+{
+    public function __construct()
+    {
+        call_user_func_array(
+            array($this, 'Swift_Transport_NullTransport::__construct'),
+            Swift_DependencyContainer::getInstance()
+                ->createDependenciesFor('transport.null')
+        );
+    }
+
+    /**
+     * Create a new NullTransport instance.
+     *
+     * @return self
+     */
+    public static function newInstance()
+    {
+        return new self();
+    }
+}