Pseudo-selectors and PHP 8.4 support

What's Changed

• Make tag names case-insensitive in HTML mode by @chrishow in #222
• Add support for last-child, first-of-type, last-of-type pseudo-selectors by @chrishow in #223
• Un scrutinizer by @g105b in #224
• Fix for PHP 8.4 by @Alkarex in #227

Full Changelog: v1.2.0...v1.2.1