fix: microsite/package.json to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-CROSSSPAWN-8303230
- https://snyk.io/vuln/SNYK-JS-HTTPPROXYMIDDLEWARE-8229906
- https://snyk.io/vuln/SNYK-JS-BRACES-6838727
- https://snyk.io/vuln/SNYK-JS-SEMVER-3247795
- https://snyk.io/vuln/SNYK-JS-WS-7266574
- https://snyk.io/vuln/SNYK-JS-FOLLOWREDIRECTS-6141137
- https://snyk.io/vuln/SNYK-JS-BABELRUNTIME-10044504
- https://snyk.io/vuln/SNYK-JS-PATHTOREGEXP-7925106
- https://snyk.io/vuln/SNYK-JS-PATHTOREGEXP-8482416
- https://snyk.io/vuln/SNYK-JS-FOLLOWREDIRECTS-6444610
- https://snyk.io/vuln/SNYK-JS-SERIALIZEJAVASCRIPT-6147607
- https://snyk.io/vuln/SNYK-JS-BODYPARSER-7926860
- https://snyk.io/vuln/SNYK-JS-WEBPACK-7840298
- https://snyk.io/vuln/SNYK-JS-MICROMATCH-6838728
- https://snyk.io/vuln/SNYK-JS-COOKIE-8163060
- https://snyk.io/vuln/SNYK-JS-HTTPPROXYMIDDLEWARE-9691387
- https://snyk.io/vuln/SNYK-JS-HTTPPROXYMIDDLEWARE-9691389
- https://snyk.io/vuln/SNYK-JS-EXPRESS-6474509
- https://snyk.io/vuln/SNYK-JS-POSTCSS-5926692
- https://snyk.io/vuln/SNYK-JS-EXPRESS-7926867
- https://snyk.io/vuln/SNYK-JS-PRISMJS-9055448
- https://snyk.io/vuln/SNYK-JS-SEND-7926862
- https://snyk.io/vuln/SNYK-JS-SERVESTATIC-7926865

Author: snyk-io[bot]

microsite/package.json

@@ -29,9 +29,9 @@
   },
   "prettier": "@spotify/prettier-config",
   "dependencies": {
-    "@docusaurus/core": "0.0.0-5591",
+    "@docusaurus/core": "3.0.0",
     "@docusaurus/plugin-client-redirects": "0.0.0-5591",
-    "@docusaurus/preset-classic": "0.0.0-5591",
+    "@docusaurus/preset-classic": "3.0.0",
     "@swc/core": "^1.3.46",
     "clsx": "^1.1.1",
     "docusaurus-plugin-sass": "^0.2.3",