fix warning about potential arithmetic overflow: remove unnecessary c…

…alculations

https://github.com/work-examples/key-value-web-server-lock-free/security/code-scanning/73

Arithmetic overflow: Using operator '' on a 4 byte value and then casting the result to a 8 byte value. Cast the value to the wider type before calling operator '' to avoid overflow (io.2).

AllocatorFactory.cpp

@@ -10,7 +10,7 @@
 const AllocatorFactory::DefaultAllocator& AllocatorFactory::get_current_thread_allocator()
 {
     static std::shared_mutex protect;
-    static std::unordered_map<std::thread::id, DefaultAllocator> allocators(std::thread::hardware_concurrency() * 2);
+    static std::unordered_map<std::thread::id, DefaultAllocator> allocators;
 
     const std::thread::id threadId = std::this_thread::get_id();