chore(deps-dev): bump js-yaml from 3.14.1 to 4.0.0 in /microsite

Bumps [js-yaml](https://github.com/nodeca/js-yaml) from 3.14.1 to 4.0.0.
- [Release notes](https://github.com/nodeca/js-yaml/releases)
- [Changelog](https://github.com/nodeca/js-yaml/blob/master/CHANGELOG.md)
- [Commits](https://github.com/nodeca/js-yaml/compare/3.14.1...4.0.0)

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

microsite/package.json

@@ -16,7 +16,7 @@
   "devDependencies": {
     "@spotify/prettier-config": "^9.0.0",
     "docusaurus": "^2.0.0-alpha.378053ac5",
-    "js-yaml": "^3.14.1",
+    "js-yaml": "^4.0.0",
     "prettier": "^2.2.1"
   },
   "prettier": "@spotify/prettier-config"