Added missing <chrono> header

This header is required for compilation on newer compilers

Relates-To: MINOR

Signed-off-by: Andrey Kashcheev <ext-andrey.kashcheev@here.com>

Author: andrey-kashcheev

olp-cpp-sdk-core/tests/thread/ThreadPoolTaskSchedulerTest.cpp

@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2019-2021 HERE Europe B.V.
+ * Copyright (C) 2019-2025 HERE Europe B.V.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -17,6 +17,7 @@
  * License-Filename: LICENSE
  */
 
+#include <chrono>
 #include <thread>
 #include <unordered_map>