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

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-WEBPACKDEVSERVER-10300775
- https://snyk.io/vuln/SNYK-JS-WEBPACKDEVSERVER-10300777

Author: snyk-bot

package.json

@@ -30,9 +30,9 @@
     "typecheck": "tsc"
   },
   "dependencies": {
-    "@docusaurus/core": "^2.4.1",
+    "@docusaurus/core": "^3.9.0",
     "@docusaurus/module-type-aliases": "^2.4.1",
-    "@docusaurus/preset-classic": "^2.4.1",
+    "@docusaurus/preset-classic": "^3.9.0",
     "@docusaurus/theme-common": "^2.4.1",
     "@docusaurus/tsconfig": "^3.0.0-alpha.0",
     "@mdx-js/react": "^1.6.22",