Should use alignas instead of std::aligned_storage

[UMU618]

https://github.com/ArgishtiAyvazyan/FastPimpl/blob/2d9fcd7d99a75ebff34192a2f7c1d9f68e5701e1/include/FastPimpl.h#L182C5-L182C27

error C4996: 'std::aligned_storage_t': warning STL4034: std::aligned_storage and std::aligned_storage_t are deprecated in C++23. Prefer alignas(T) std::byte t_buff[sizeof(T)]. You can define _SILENCE_CXX23_ALIGNED_STORAGE_DEPRECATION_WARNING or _SILENCE_ALL_CXX23_DEPRECATION_WARNINGS to suppress this warning.