build(deps-dev): bump prettier from 2.2.0 to 2.2.1 in /microsite (#3490)

Bumps [prettier](https://github.com/prettier/prettier) from 2.2.0 to 2.2.1.
- [Release notes](https://github.com/prettier/prettier/releases)
- [Changelog](https://github.com/prettier/prettier/blob/master/CHANGELOG.md)
- [Commits](https://github.com/prettier/prettier/compare/2.2.0...2.2.1)

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

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

microsite/package.json

@@ -17,7 +17,7 @@
     "@spotify/prettier-config": "^9.0.0",
     "docusaurus": "^2.0.0-alpha.66",
     "js-yaml": "^3.14.0",
-    "prettier": "^2.2.0"
+    "prettier": "^2.2.1"
   },
   "prettier": "@spotify/prettier-config"
 }