add unclaimed username to v0.dev

Author: sk337

sherlock_project/resources/data.json

@@ -2807,6 +2807,7 @@
     "errorType": "status_code",
     "url": "https://v0.dev",
     "urlMain": "https://v0.dev",
-    "username_claimed": "t3dotgg"
+    "username_claimed": "t3dotgg",
+    "username_unclaimed": "840ab86d44fe1d05",
   }
 }