Commit 2fc7731

* Fix i686 with u32 parsing hack by @kivikakk in https://github.com/gjtorikian/commonmarker/pull/471

* feat: Upgrade to comrak 0.54 with math_latex + alert_style options, and changed header_ids by @gjtorikian in https://github.com/gjtorikian/commonmarker/pull/472

⚠️ The heading anchor markup changed (from upstream). The `id` now lives on the heading element and the anchor moved to the end with `aria-label` + `data-heading-content`, replacing the leading `aria-hidden` link. CSS/JS targeting the old markup will be affected. See https://github.com/kivikakk/comrak/pull/808 for more information.

**Full Changelog**: https://github.com/gjtorikian/commonmarker/compare/v2.8.3...v2.9.0