chore(deps): bump uikit from 3.21.10 to 3.21.13

Bumps [uikit](https://github.com/uikit/uikit) from 3.21.10 to 3.21.13.
- [Release notes](https://github.com/uikit/uikit/releases)
- [Changelog](https://github.com/uikit/uikit/blob/develop/CHANGELOG.md)
- [Commits](uikit/uikit@v3.21.10...v3.21.13)

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

Signed-off-by: dependabot[bot] <support@github.com>

package.json

@@ -6,7 +6,7 @@
     "@fortawesome/fontawesome-free": "^6.5.2",
     "highlight.js": "^11.9.0",
     "katex": "^0.16.11",
-    "uikit": "^3.21.10",
+    "uikit": "^3.21.13",
     "www-covidcast": "https://github.com/cmu-delphi/www-covidcast/releases/download/v3.2.10/www-covidcast-3.2.10.tgz",
     "www-covidcast-classic": "https://github.com/cmu-delphi/www-covidcast-classic/releases/download/v2.6.7/www-covidcast-classic-2.6.7.tgz",
     "www-epivis": "https://github.com/cmu-delphi/www-epivis/releases/download/v2.1.4/www-epivis-2.1.4.tgz"