build(deps): bump uikit from 3.6.20 to 3.6.21

Bumps [uikit](https://github.com/uikit/uikit) from 3.6.20 to 3.6.21.
- [Release notes](https://github.com/uikit/uikit/releases)
- [Changelog](https://github.com/uikit/uikit/blob/develop/CHANGELOG.md)
- [Commits](uikit/uikit@v3.6.20...v3.6.21)

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

Author: dependabot[bot]

package-lock.json

@@ -6,7 +6,7 @@
     "@fortawesome/fontawesome-free": "^5.15.3",
     "highlight.js": "^10.7.2",
     "katex": "^0.13.5",
-    "uikit": "^3.6.20",
+    "uikit": "^3.6.21",
     "www-covidcast": "https://github.com/cmu-delphi/www-covidcast/releases/download/v2.4.0/www-covidcast-2.4.0.tgz"
   },
   "devDependencies": {