Reserved words seems outdated

[zobo]

I've seen errors like this zobo/php-language-server#81 because namespace/classes used reserved words - that the list https://www.php.net/manual/en/reserved.other-reserved-words.php does not include anymore. https://github.com/microsoft/tolerant-php-parser/blob/main/src/TokenStringMaps.php#L103

Propose to clean up the list.