chore(deps-dev): bump @spotify/prettier-config in /microsite

Bumps [@spotify/prettier-config](https://github.com/spotify/web-scripts) from 8.0.0 to 9.0.0.
- [Release notes](https://github.com/spotify/web-scripts/releases)
- [Changelog](https://github.com/spotify/web-scripts/blob/master/CHANGELOG.md)
- [Commits](https://github.com/spotify/web-scripts/compare/v8.0.0...v9.0.0)

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

microsite/package.json

@@ -14,7 +14,7 @@
     "rename-version": "docusaurus-rename-version"
   },
   "devDependencies": {
-    "@spotify/prettier-config": "^8.0.0",
+    "@spotify/prettier-config": "^9.0.0",
     "docusaurus": "^2.0.0-alpha.66",
     "js-yaml": "^3.14.0",
     "prettier": "^2.0.5"

microsite/yarn.lock

@@ -959,10 +959,10 @@
   resolved "https://registry.npmjs.org/@sindresorhus/is/-/is-0.7.0.tgz#9a06f4f137ee84d7df0460c1fdb1135ffa6c50fd"
   integrity sha512-ONhaKPIufzzrlNbqtWFFd+jlnemX6lJAgq9ZeiZtS7I1PIf/la7CW4m83rTXRnVnsMbW2k56pGYu7AUFJD9Pow==
 
-"@spotify/prettier-config@^8.0.0":
-  version "8.0.0"
-  resolved "https://registry.npmjs.org/@spotify/prettier-config/-/prettier-config-8.0.0.tgz#8b6c2bd579ddc54887155a0721fe04e96c89f7f2"
-  integrity sha512-so8w32ZV42CHWxOEXcBtbNO/hLXFrQNXVmhfzhUI6dVB9cq2xjRaiqu8GjFj8LvKbWpPj+S+KwTIS4aDVWqrFQ==
+"@spotify/prettier-config@^9.0.0":
+  version "9.0.0"
+  resolved "https://registry.yarnpkg.com/@spotify/prettier-config/-/prettier-config-9.0.0.tgz#7b562d56573c6fc0094446fbc92b22bc318945dc"
+  integrity sha512-In1q0tIiqTYKAGe3KOHDcFDdZRFISyQeSeipeTHGfki23ebHRZcjxvqj5SSdBkw65D4VpSREMi0s9i5iJiMcTw==
 
 "@types/cheerio@^0.22.8":
   version "0.22.21"