build(deps): bump katex from 0.13.13 to 0.13.18

Bumps [katex](https://github.com/KaTeX/KaTeX) from 0.13.13 to 0.13.18.
- [Release notes](https://github.com/KaTeX/KaTeX/releases)
- [Changelog](https://github.com/KaTeX/KaTeX/blob/master/CHANGELOG.md)
- [Commits](KaTeX/KaTeX@v0.13.13...v0.13.18)

---
updated-dependencies:
- dependency-name: katex
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

package-lock.json

@@ -5,7 +5,7 @@
   "dependencies": {
     "@fortawesome/fontawesome-free": "^5.15.4",
     "highlight.js": "^11.2.0",
-    "katex": "^0.13.13",
+    "katex": "^0.13.18",
     "uikit": "^3.7.2",
     "www-covidcast": "https://github.com/cmu-delphi/www-covidcast/releases/download/v2.8.0/www-covidcast-2.8.0.tgz",
     "www-covidcast-classic": "https://github.com/cmu-delphi/www-covidcast-classic/releases/download/v2.6.0/www-covidcast-classic-2.6.0.tgz",