test: increase test timeout to prevent flakiness

This increases the waiting time for each event from 500 to 750 ms.
The former timeout could be hit on very slow machines with high load.

PR-URL: #31716
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>

test/parallel/test-repl.js

@@ -861,7 +861,7 @@ function event(ee, expected) {
       const data = inspect(expected, { compact: false });
       const msg = `The REPL did not reply as expected for:\n\n${data}`;
       reject(new Error(msg));
-    }, common.platformTimeout(500));
+    }, common.platformTimeout(1000));
     ee.once('data', common.mustCall((...args) => {
       clearTimeout(timeout);
       resolve(...args);