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

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-BRACEEXPANSION-9789073

Author: snyk-bot

package.json

@@ -15,8 +15,8 @@
     "typecheck": "tsc"
   },
   "dependencies": {
-    "@docusaurus/core": "3.0.1",
-    "@docusaurus/preset-classic": "3.0.1",
+    "@docusaurus/core": "3.8.0",
+    "@docusaurus/preset-classic": "3.8.0",
     "@mdx-js/react": "^1.6.22",
     "autoprefixer": "^10.4.18",
     "clsx": "^1.2.1",