Bumps [highlight.js](https://github.com/highlightjs/highlight.js) from 9.17.1 to 9.18.1.
- [Release notes](https://github.com/highlightjs/highlight.js/releases)
- [Changelog](https://github.com/highlightjs/highlight.js/blob/9.18.1/CHANGES.md)
- [Commits](https://github.com/highlightjs/highlight.js/compare/9.17.1...9.18.1)
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