fix: microsite/package.json to reduce vulnerabilities

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

Author: snyk-bot

microsite/package.json

@@ -29,17 +29,17 @@
   },
   "prettier": "@spotify/prettier-config",
   "dependencies": {
-    "@docusaurus/core": "0.0.0-5591",
+    "@docusaurus/core": "3.8.0",
     "@docusaurus/plugin-client-redirects": "0.0.0-5591",
-    "@docusaurus/preset-classic": "0.0.0-5591",
+    "@docusaurus/preset-classic": "3.8.0",
     "@swc/core": "^1.3.46",
     "clsx": "^1.1.1",
     "docusaurus-plugin-sass": "^0.2.3",
     "luxon": "^3.0.0",
     "prism-react-renderer": "^1.3.5",
     "react": "^17.0.2",
     "react-dom": "^17.0.2",
-    "sass": "^1.57.1",
+    "sass": "^1.79.0",
     "swc-loader": "^0.2.3"
   }
 }