Bump katex from 0.16.10 to 0.16.21

Bumps [katex](https://github.com/KaTeX/KaTeX) from 0.16.10 to 0.16.21.
- [Release notes](https://github.com/KaTeX/KaTeX/releases)
- [Changelog](https://github.com/KaTeX/KaTeX/blob/main/CHANGELOG.md)
- [Commits](KaTeX/KaTeX@v0.16.10...v0.16.21)

---
updated-dependencies:
- dependency-name: katex
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

package-lock.json

@@ -47,7 +47,7 @@
     "bootstrap": "^5.3.2",
     "date-fns": "^2.29.3",
     "fuse.js": "^6.5.3",
-    "katex": "^0.16.10",
+    "katex": "^0.16.21",
     "mark.js": "^8.11.1",
     "masonry-layout": "^4.2.2",
     "mermaid": "^10.9.3",