fix: website/package.json & website/package-lock.json to reduce vulnerabilities (#2975)

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-NANOID-8492085

Co-authored-by: snyk-bot <[email protected]>

Author: thomaspoignant

Diff for: website/package-lock.json

@@ -33,7 +33,7 @@
     "json2toml": "^4.0.1",
     "lodash": "^4.17.21",
     "mobx": "^6.9.0",
-    "postcss": "^8.4.47",
+    "postcss": "^8.5.0",
     "prism-react-renderer": "^2.1.0",
     "prop-types": "^15.8.1",
     "react": "^18.2.15",