fix: wrong id sent on "next" messages in pubsub (#9)

Author: reconbot

src/pubsub/publish.ts

@@ -30,7 +30,7 @@ export const publish = (c: ServerClosure) => async (event: PubSubEvent) => {
     await sendMessage({
       ...sub.requestContext,
       message: {
-        id: sub.id,
+        id: sub.subscriptionId,
         type: MessageType.Next,
         payload: await result,
       },