Bump katex from 0.16.38 to 0.18.4 in /docs

Bumps [katex](https://github.com/KaTeX/KaTeX) from 0.16.38 to 0.18.4.
- [Release notes](https://github.com/KaTeX/KaTeX/releases)
- [Changelog](https://github.com/KaTeX/KaTeX/blob/main/CHANGELOG.md)
- [Commits](KaTeX/KaTeX@v0.16.38...v0.18.4)

---
updated-dependencies:
- dependency-name: katex
  dependency-version: 0.18.4
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

docs/package-lock.json

@@ -19,7 +19,7 @@
     "@vuepress/plugin-markdown-math": "2.0.0-rc.132",
     "@vuepress/plugin-markdown-tab": "2.0.0-rc.132",
     "@vuepress/plugin-slimsearch": "2.0.0-rc.130",
-    "katex": "0.16.38",
+    "katex": "0.18.4",
     "sass-embedded": "1.100.0",
     "sass-loader": "16.0.8",
     "tsx": "4.23.5",