src: prefer make_unique

In most of the code base we use make_unique instead of
new unique_ptr. Update node_platform.cc to be consistent
with that.

Signed-off-by: Michael Dawson <michael_dawson@ca.ibm.com>

PR-URL: #33378
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Zeyu Yang <himself65@outlook.com>
Reviewed-By: Juan José Arboleda <soyjuanarbol@gmail.com>

Author: mhdawson

src/node_platform.cc

@@ -65,13 +65,13 @@ class WorkerThreadsTaskRunner::DelayedTaskScheduler {
   }
 
   void PostDelayedTask(std::unique_ptr<Task> task, double delay_in_seconds) {
-    tasks_.Push(std::unique_ptr<Task>(new ScheduleTask(this, std::move(task),
-                                                       delay_in_seconds)));
+    tasks_.Push(std::make_unique<ScheduleTask>(this, std::move(task),
+                                               delay_in_seconds));
     uv_async_send(&flush_tasks_);
   }
 
   void Stop() {
-    tasks_.Push(std::unique_ptr<Task>(new StopTask(this)));
+    tasks_.Push(std::make_unique<StopTask>(this));
     uv_async_send(&flush_tasks_);
   }