benchmark: use let instead of var in worker

PR-URL: https://github.com/nodejs/node/pull/31794
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/benchmark/worker/echo.js b/benchmark/worker/echo.js
index 8d45a1f76b..7988ffc7e1 100644
--- a/benchmark/worker/echo.js
+++ b/benchmark/worker/echo.js
@@ -55,7 +55,7 @@ function main({ n, workers, sendsPerBroadcast: sends, payload: payloadType }) {
       return;
     }
     for (const worker of workerObjs) {
-      for (var i = 0; i < sends; ++i)
+      for (let i = 0; i < sends; ++i)
         worker.postMessage(payload);
     }
   }