Bump tailwindcss from 2.1.4 to 2.2.2 in /packages/dashboard

Bumps [tailwindcss](https://github.com/tailwindlabs/tailwindcss) from 2.1.4 to 2.2.2.
- [Release notes](https://github.com/tailwindlabs/tailwindcss/releases)
- [Changelog](https://github.com/tailwindlabs/tailwindcss/blob/master/CHANGELOG.md)
- [Commits](https://github.com/tailwindlabs/tailwindcss/compare/v2.1.4...v2.2.2)

---
updated-dependencies:
- dependency-name: tailwindcss
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

packages/dashboard/package.json

@@ -33,7 +33,7 @@
     "stripe": "8.156.0",
     "superagent": "6.1.0",
     "swr": "0.5.6",
-    "tailwindcss": "2.1.4",
+    "tailwindcss": "2.2.2",
     "yup": "0.32.9"
   }
 }