fix: website/package.json & website/yarn.lock to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-BABELTRAVERSE-5962462
- https://snyk.io/vuln/SNYK-JS-WEBPACK-7840298
- https://snyk.io/vuln/SNYK-JS-SERIALIZEJAVASCRIPT-6147607
- https://snyk.io/vuln/SNYK-JS-PATHTOREGEXP-7925106
- https://snyk.io/vuln/SNYK-JS-POSTCSS-5926692

Author: snyk-bot

website/package.json

@@ -12,9 +12,9 @@
   },
   "devDependencies": {},
   "dependencies": {
-    "@docusaurus/core": "^2.3.1",
+    "@docusaurus/core": "^3.6.0",
     "@docusaurus/plugin-google-analytics": "^2.3.1",
-    "@docusaurus/preset-classic": "^2.3.1",
+    "@docusaurus/preset-classic": "^3.6.0",
     "@docusaurus/utils": "^2.3.1",
     "classnames": "^2.2.6",
     "js-yaml": "^3.12.0",