chore(deps): update dependency @astrojs/starlight to ^0.39.0

Author: renovate[bot]

docs/package-lock.json

@@ -13,7 +13,7 @@
   },
   "dependencies": {
     "@astrojs/check": "^0.9.8",
-    "@astrojs/starlight": "^0.38.1",
+    "@astrojs/starlight": "^0.39.0",
     "astro": "^6.0.5",
     "sharp": "^0.34.0",
     "starlight-links-validator": "^0.24.0",