chore(deps): bump katex in the npm_and_yarn group across 1 directory (#152)

Bumps the npm_and_yarn group with 1 update in the / directory: [katex](https://github.com/KaTeX/KaTeX).


Updates `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-version: 0.16.21
  dependency-type: direct:production
  dependency-group: npm_and_yarn
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

package.json

@@ -83,7 +83,7 @@
     "hls.js": "^1.6.5",
     "ini": "^5.0.0",
     "just-once": "^2.2.0",
-    "katex": "0.16.11",
+    "katex": "0.16.21",
     "libass-wasm": "^4.1.0",
     "libheif-js": "^1.19.8",
     "lightgallery": "^2.8.3",