chore(deps-dev): bump prettier from 2.3.2 to 2.4.0 in /microsite

Bumps [prettier](https://github.com/prettier/prettier) from 2.3.2 to 2.4.0.
- [Release notes](https://github.com/prettier/prettier/releases)
- [Changelog](https://github.com/prettier/prettier/blob/main/CHANGELOG.md)
- [Commits](https://github.com/prettier/prettier/compare/2.3.2...2.4.0)

---
updated-dependencies:
- dependency-name: prettier
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

microsite/package.json

@@ -19,7 +19,7 @@
     "@spotify/prettier-config": "^11.0.0",
     "docusaurus": "^2.0.0-alpha.70",
     "js-yaml": "^4.1.0",
-    "prettier": "^2.3.2",
+    "prettier": "^2.4.0",
     "yarn-lock-check": "^1.0.5"
   },
   "prettier": "@spotify/prettier-config"

microsite/yarn.lock

@@ -5207,10 +5207,10 @@ prepend-http@^2.0.0:
   resolved "https://registry.npmjs.org/prepend-http/-/prepend-http-2.0.0.tgz#e92434bfa5ea8c19f41cdfd401d741a3c819d897"
   integrity sha1-6SQ0v6XqjBn0HN/UAddBo8gZ2Jc=
 
-prettier@^2.3.2:
-  version "2.3.2"
-  resolved "https://registry.npmjs.org/prettier/-/prettier-2.3.2.tgz#ef280a05ec253712e486233db5c6f23441e7342d"
-  integrity sha512-lnJzDfJ66zkMy58OL5/NY5zp70S7Nz6KqcKkXYzn2tMVrNxvbqaBpg7H3qHaLxCJ5lNMsGuM8+ohS7cZrthdLQ==
+prettier@^2.4.0:
+  version "2.4.0"
+  resolved "https://registry.yarnpkg.com/prettier/-/prettier-2.4.0.tgz#85bdfe0f70c3e777cf13a4ffff39713ca6f64cba"
+  integrity sha512-DsEPLY1dE5HF3BxCRBmD4uYZ+5DCbvatnolqTqcxEgKVZnL2kUfyu7b8pPQ5+hTBkdhU9SLUmK0/pHb07RE4WQ==
 
 prismjs@^1.22.0:
   version "1.23.0"