Update dependency starlight-links-validator to ^0.20.0

Author: renovate[bot]

website/package.json

@@ -12,7 +12,7 @@
     "@astrojs/starlight": "^0.37.0",
     "astro": "^5.6.1",
     "sharp": "^0.34.0",
-    "starlight-links-validator": "^0.19.0",
+    "starlight-links-validator": "^0.20.0",
     "starlight-versions": "^0.7.0"
   }
 }