Fix various compatibility issues with PHP 8

libs/swiftmailer/classes/Swift/SwiftException.php

@@ -0,0 +1,29 @@
+<?php
+
+/*
+ * This file is part of SwiftMailer.
+ * (c) 2004-2009 Chris Corbyn
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Base Exception class.
+ *
+ * @author Chris Corbyn
+ */
+class Swift_SwiftException extends Exception
+{
+    /**
+     * Create a new SwiftException with $message.
+     *
+     * @param string    $message
+     * @param int       $code
+     * @param Exception $previous
+     */
+    public function __construct($message, $code = 0, Exception $previous = null)
+    {
+        parent::__construct($message, $code, $previous);
+    }
+}