Install psalm as dev, sync scripts updates

vendor/felixfbecker/language-server-protocol/src/MessageActionItem.php

@@ -0,0 +1,19 @@
+<?php
+
+namespace LanguageServerProtocol;
+
+class MessageActionItem
+{
+    /**
+     * A short title like 'Retry', 'Open Log' etc.
+     *
+     * @var string
+     */
+    public $title;
+
+    public function __construct(string $title = null)
+    {
+        /** @psalm-suppress PossiblyNullPropertyAssignmentValue */
+        $this->title = $title;
+    }
+}