[ticket/17176] Cleaned up psalm stubs folder

PHPBB3-17176

build/psalm/stubs/redis.php

@@ -0,0 +1,19 @@
+<?php
+/**
+ *
+ * This file is part of the phpBB Forum Software package.
+ *
+ * @copyright (c) phpBB Limited <https://www.phpbb.com>
+ * @license GNU General Public License, version 2 (GPL-2.0)
+ *
+ * For full copyright and license information, please see
+ * the docs/CREDITS.txt file.
+ *
+ */
+
+/** @link https://phpredis.github.io/phpredis/Redis.html */
+class Redis
+{
+	public const OPT_PREFIX = 2;
+	public const SERIALIZER_PHP = 1;
+}