Bump katex from 0.16.20 to 0.16.21

Bumps [katex](https://github.com/KaTeX/KaTeX) from 0.16.20 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@v0.16.20...v0.16.21)

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

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

Author: dependabot[bot]

yarn.lock

@@ -3793,9 +3793,9 @@ jszip@^3.7.1:
     setimmediate "^1.0.5"
 
 katex@^0.16.20, katex@^0.16.9:
-  version "0.16.20"
-  resolved "https://registry.yarnpkg.com/katex/-/katex-0.16.20.tgz#75c741ded0f7ee8d896a1d31bac307e61af863c3"
-  integrity sha512-jjuLaMGD/7P8jUTpdKhA9IoqnH+yMFB3sdAFtq5QdAqeP2PjiSbnC3EaguKPNtv6dXXanHxp1ckwvF4a86LBig==
+  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"