build(deps): 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: indirect
...

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

yarn.lock

@@ -17708,13 +17708,13 @@ __metadata:
   linkType: hard
 
 "katex@npm:^0.16.9":
-  version: 0.16.10
-  resolution: "katex@npm:0.16.10"
+  version: 0.16.21
+  resolution: "katex@npm:0.16.21"
   dependencies:
     commander: ^8.3.0
   bin:
     katex: cli.js
-  checksum: 108e9d810e17840c43eef8d46171096f4cc97852bfd1e2dd1890d9b3435846816e3e98678a31d38bd064eb97eea83b18ff224cb65d5f9511b54ce7ff4359b591
+  checksum: 14180322a4e8fe9e4227a08b7d86fde9ee445859ff534e6a540b85eb5022b39ea2be70082776cce8c59b891c247fce3d1c1a090ea7821e005fd8b7bfee714936
   languageName: node
   linkType: hard