Bump postcss-focus-visible from 7.1.0 to 9.0.0 in /website

Bumps [postcss-focus-visible](https://github.com/csstools/postcss-plugins/tree/HEAD/plugins/postcss-focus-visible) from 7.1.0 to 9.0.0.
- [Changelog](https://github.com/csstools/postcss-plugins/blob/main/plugins/postcss-focus-visible/CHANGELOG.md)
- [Commits](https://github.com/csstools/postcss-plugins/commits/HEAD/plugins/postcss-focus-visible)

---
updated-dependencies:
- dependency-name: postcss-focus-visible
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

website/package.json

@@ -68,7 +68,7 @@
     "next-i18next": "^13.3.0",
     "nodemailer": "^6.9.3",
     "pino": "^8.14.1",
-    "postcss-focus-visible": "^7.1.0",
+    "postcss-focus-visible": "^9.0.0",
     "react": "^18.2.0",
     "react-chartjs-2": "^5.2.0",
     "react-cookie": "^4.1.1",