Install psalm as dev, sync scripts updates

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

@@ -0,0 +1,29 @@
+<?php
+
+namespace LanguageServerProtocol;
+
+class DefinitionClientCapabilities
+{
+
+    /**
+     * Whether definition supports dynamic registration.
+     *
+     * @var bool|null
+     */
+    public $dynamicRegistration;
+
+    /**
+     * The client supports additional metadata in the form of definition links.
+     *
+     * @since 3.14.0
+     *
+     * @var bool|null
+     */
+    public $linkSupport;
+
+    public function __construct(bool $dynamicRegistration = null, bool $linkSupport = null)
+    {
+        $this->dynamicRegistration = $dynamicRegistration;
+        $this->linkSupport = $linkSupport;
+    }
+}