Bump katex from 0.16.11 to 0.16.21
Bumps [katex](https://github.com/KaTeX/KaTeX) from 0.16.11 to 0.16.21. - [Release notes](https://github.com/KaTeX/KaTeX/releases) - [Changelog](https://github.com/KaTeX/KaTeX/blob/main/CHANGELOG.md) - [Commits](https://github.com/KaTeX/KaTeX/compare/v0.16.11...v0.16.21) --- updated-dependencies: - dependency-name: katex dependency-type: indirect ... Signed-off-by: dependabot[bot] <[email protected]>