fix(serverless): wrapEventFunction does not await for async

Author: ahmedetefy

packages/serverless/src/gcpfunction/events.ts

@@ -29,7 +29,7 @@ function _wrapEventFunction(
     flushTimeout: 2000,
     ...wrapOptions,
   };
-  return (data, context, callback) => {
+  return async (data, context, callback) => {
     const transaction = startTransaction({
       name: context.eventType,
       op: 'gcp.function.event',