benchmark: add trailing commas

PR-URL: https://github.com/nodejs/node/pull/46370
Reviewed-By: Yagiz Nizipli <yagiz@nizipli.com>
Reviewed-By: Moshe Atlow <moshe@atlow.co.il>
Reviewed-By: James M Snell <jasnell@gmail.com>

benchmark/napi/function_call/index.js

@@ -38,7 +38,7 @@ assert(js() === cxx());
 
 const bench = common.createBenchmark(main, {
   type: ['js', 'cxx', 'napi'],
-  n: [1e6, 1e7, 5e7]
+  n: [1e6, 1e7, 5e7],
 });
 
 function main({ n, type }) {