src: call uv_library_shutdown before DisposePlatform

When the process exits, there may be tasks in the thread pool
that need to access data in the platform, such as trace agent.
So make sure the thread pool exits first.
see #44458

src/api/environment.cc

@@ -773,8 +773,8 @@ void DefaultProcessExitHandlerInternal(Environment* env, ExitCode exit_code) {
   env->set_can_call_into_js(false);
   env->stop_sub_worker_contexts();
   env->isolate()->DumpAndResetStats();
-  DisposePlatform();
   uv_library_shutdown();
+  DisposePlatform();
   Exit(exit_code);
 }