build(deps): bump katex from 0.16.18 to 0.16.21

Bumps [katex](https://github.com/KaTeX/KaTeX) from 0.16.18 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@v0.16.18...v0.16.21)

---
updated-dependencies:
- dependency-name: katex
  dependency-type: indirect
...

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

Author: dependabot[bot]

yarn.lock

@@ -16491,9 +16491,9 @@ [email protected]:
     source-map-support "^0.5.5"
 
 katex@^0.16.0, katex@^0.16.9:
-  version "0.16.18"
-  resolved "https://registry.yarnpkg.com/katex/-/katex-0.16.18.tgz#20781284288bc52805c519e48ac756163ad4b1f3"
-  integrity sha512-LRuk0rPdXrecAFwQucYjMiIs0JFefk6N1q/04mlw14aVIVgxq1FO0MA9RiIIGVaKOB5GIP5GH4aBBNraZERmaQ==
+  version "0.16.21"
+  resolved "https://registry.yarnpkg.com/katex/-/katex-0.16.21.tgz#8f63c659e931b210139691f2cc7bb35166b792a3"
+  integrity sha512-XvqR7FgOHtWupfMiigNzmh+MgUVmDGU2kXZm899ZkPfcuoPuFxyHmXsgATDpFZDAXCI8tvinaVcDo8PIIJSo4A==
   dependencies:
     commander "^8.3.0"