chore(website): update dependency @astrojs/starlight to v0.34.0

Author: renovate[bot]

site/package.json

@@ -16,7 +16,7 @@
   },
   "license": "MIT",
   "dependencies": {
-    "@astrojs/starlight": "0.32.4",
+    "@astrojs/starlight": "0.34.0",
     "@bugsnag/js": "8.2.0",
     "astro": "5.2.5",
     "markdown-magic": "2.6.1",