Install psalm as dev, sync scripts updates

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

@@ -0,0 +1,20 @@
+<?php
+
+namespace LanguageServerProtocol;
+
+class ShowMessageRequestClientCapabilities
+{
+
+    /**
+     * Capabilities specific to the `MessageActionItem` type.
+     *
+     * @var ShowMessageRequestClientCapabilitiesMessageActionItem|null
+     */
+    public $messageActionItem;
+
+
+    public function __construct(ShowMessageRequestClientCapabilitiesMessageActionItem $messageActionItem = null)
+    {
+        $this->messageActionItem = $messageActionItem;
+    }
+}