[misc] fix express deprecations

Co-Authored-By: Jakob Ackermann <jakob.ackermann@overleaf.com>

services/chat/app/js/Features/Messages/MessageHttpController.js

@@ -161,7 +161,7 @@ module.exports = MessageHttpController = {
         if (error != null) {
           return next(error)
         }
-        return res.status(204).send()
+        return res.sendStatus(204)
       })
     })
   },