test: move to for of loop in test-http-hostname-typechecking.js

PR-URL: #50782
Reviewed-By: Rafael Gonzaga <[email protected]>
Reviewed-By: Marco Ippolito <[email protected]>

Author: Puppo

test/parallel/test-http-hostname-typechecking.js

@@ -36,7 +36,8 @@ vals.forEach((v) => {
 // These values are OK and should not throw synchronously.
 // Only testing for 'hostname' validation so ignore connection errors.
 const dontCare = () => {};
-['', undefined, null].forEach((v) => {
+const values = ['', undefined, null];
+for (const v of values) {
   http.request({ hostname: v }).on('error', dontCare).end();
   http.request({ host: v }).on('error', dontCare).end();
-});
+}