build(deps-dev): bump prettier from 2.1.2 to 2.2.0 in /microsite

Bumps [prettier](https://github.com/prettier/prettier) from 2.1.2 to 2.2.0.
- [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/2.1.2...2.2.0)

Signed-off-by: dependabot[bot] <support@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": "^2.0.5"
+    "prettier": "^2.2.0"
   },
   "prettier": "@spotify/prettier-config"
 }

microsite/yarn.lock

@@ -5204,10 +5204,10 @@ prepend-http@^2.0.0:
   resolved "https://registry.npmjs.org/prepend-http/-/prepend-http-2.0.0.tgz#e92434bfa5ea8c19f41cdfd401d741a3c819d897"
   integrity sha1-6SQ0v6XqjBn0HN/UAddBo8gZ2Jc=
 
-prettier@^2.0.5:
-  version "2.1.2"
-  resolved "https://registry.npmjs.org/prettier/-/prettier-2.1.2.tgz#3050700dae2e4c8b67c4c3f666cdb8af405e1ce5"
-  integrity sha512-16c7K+x4qVlJg9rEbXl7HEGmQyZlG4R9AgP+oHKRMsMsuk8s+ATStlf1NpDqyBI1HpVyfjLOeMhH2LvuNvV5Vg==
+prettier@^2.2.0:
+  version "2.2.0"
+  resolved "https://registry.yarnpkg.com/prettier/-/prettier-2.2.0.tgz#8a03c7777883b29b37fb2c4348c66a78e980418b"
+  integrity sha512-yYerpkvseM4iKD/BXLYUkQV5aKt4tQPqaGW6EsZjzyu0r7sVZZNPJW4Y8MyKmicp6t42XUPcBVA+H6sB3gqndw==
 
 prismjs@^1.17.1:
   version "1.21.0"