chore(deps): bump katex from 0.16.19 to 0.16.21 in /web (#4132)

Bumps [katex](https://github.com/KaTeX/KaTeX) from 0.16.19 to 0.16.21.
- [Release notes](https://github.com/KaTeX/KaTeX/releases)
- [Changelog](https://github.com/KaTeX/KaTeX/blob/main/CHANGELOG.md)
- [Commits](https://github.com/KaTeX/KaTeX/compare/v0.16.19...v0.16.21)

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

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

web/package-lock.json

@@ -22359,15 +22359,14 @@
 			}
 		},
 		"node_modules/katex": {
-			"version": "0.16.19",
-			"resolved": "https://registry.npmjs.org/katex/-/katex-0.16.19.tgz",
-			"integrity": "sha512-3IA6DYVhxhBabjSLTNO9S4+OliA3Qvb8pBQXMfC4WxXJgLwZgnfDl0BmB4z6nBMdznBsZ+CGM8DrGZ5hcguDZg==",
+			"version": "0.16.21",
+			"resolved": "https://registry.npmjs.org/katex/-/katex-0.16.21.tgz",
+			"integrity": "sha512-XvqR7FgOHtWupfMiigNzmh+MgUVmDGU2kXZm899ZkPfcuoPuFxyHmXsgATDpFZDAXCI8tvinaVcDo8PIIJSo4A==",
 			"dev": true,
 			"funding": [
 				"https://opencollective.com/katex",
 				"https://github.com/sponsors/katex"
 			],
-			"license": "MIT",
 			"dependencies": {
 				"commander": "^8.3.0"
 			},