Install psalm as dev, sync scripts updates

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

@@ -0,0 +1,37 @@
+<?php
+
+namespace LanguageServerProtocol;
+
+/**
+ * Specific capabilities for the `SymbolKind` in the
+ * `textDocument/documentSymbol` request.
+ */
+class DocumentSymbolClientCapabilitiesSymbolKind
+{
+
+    /**
+     * The symbol kind values the client supports. When this
+     * property exists the client also guarantees that it will
+     * handle values outside its set gracefully and falls back
+     * to a default value when unknown.
+     *
+     * If this property is not present the client only supports
+     * the symbol kinds from `File` to `Array` as defined in
+     * the initial version of the protocol.
+     *
+     * @var int[]
+     * @see SymbolKind
+     */
+    public $valueSet;
+
+    /**
+     * Undocumented function
+     *
+     * @param int[]|null $valueSet
+     */
+    public function __construct(array $valueSet = null)
+    {
+        /** @psalm-suppress PossiblyNullPropertyAssignmentValue */
+        $this->valueSet = $valueSet;
+    }
+}