build(deps): 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](KaTeX/KaTeX@v0.16.11...v0.16.21)

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

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

yarn.lock

@@ -5909,17 +5909,10 @@ karma-chrome-launcher@^2.2.0:
     fs-access "^1.0.0"
     which "^1.2.1"
 
-katex@^0.16.11:
-  version "0.16.11"
-  resolved "https://registry.yarnpkg.com/katex/-/katex-0.16.11.tgz#4bc84d5584f996abece5f01c6ad11304276a33f5"
-  integrity sha512-RQrI8rlHY92OLf3rho/Ts8i/XvjgguEjOkO1BEXcU3N8BqPpSzBNwV/G0Ukr+P/l3ivvJUE/Fa/CwbS6HesGNQ==
-  dependencies:
-    commander "^8.3.0"
-
-katex@^0.16.9:
-  version "0.16.9"
-  resolved "https://registry.yarnpkg.com/katex/-/katex-0.16.9.tgz#bc62d8f7abfea6e181250f85a56e4ef292dcb1fa"
-  integrity sha512-fsSYjWS0EEOwvy81j3vRA8TEAhQhKiqO+FQaKWp0m39qwOzHVBgAUBIXWj1pB+O2W3fIpNa6Y9KSKCVbfPhyAQ==
+katex@^0.16.11, katex@^0.16.9:
+  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"