foxwells.vinboard: fix timestamp

src/modules/foxwells.js

@@ -220,7 +220,7 @@ async function createBoardMessage(msg, count, fetchAttachment = true) {
         value: `[Jump](${msg.jumpLink})`,
       },
     ],
-    timestamp: msg.timestamp,
+    timestamp: new Date(msg.timestamp).toISOString(),
   };
 
   let image;