Correct use of number_of_threads_ in an array length definition. It should be max_number_of_threads to allow Windows to compile it, GCC tolerates the variable length array.

PiperOrigin-RevId: 562743538
Change-Id: I5dc6dfb54002a996fe129b91e599cccfc9420e9c

src/thread/thread_pool.h

@@ -55,7 +55,7 @@ class ThreadPool {
     }
 
     shutdown_ = true;
-    Task shutdown_tasks[number_of_threads_];
+    Task shutdown_tasks[max_number_of_threads];
     for (int i = 0; i < number_of_threads_; ++i) {
       Enqueue(&shutdown_tasks[i], ShutdownFunction, nullptr);
     }