fix: anticipate banner for security release (#8404)

Author: marco-ippolito

apps/site/site.json

@@ -28,7 +28,7 @@
   ],
   "websiteBanners": {
     "index": {
-      "startDate": "2025-12-08T23:00:00.000Z",
+      "startDate": "2025-12-08T17:00:00.000Z",
       "endDate": "2025-12-15T23:00:00.000Z",
       "text": "New security releases to be made available Monday, December 15, 2025",
       "link": "https://nodejs.org/en/blog/vulnerability/december-2025-security-releases",