refactor: use core/swap.hpp over boost/swap.hpp

The later is deprecated:
```cpp
ifndef BOOST_SWAP_HPP
define BOOST_SWAP_HPP

// The header file at this path is deprecated;
// use boost/core/swap.hpp instead.

include <boost/core/swap.hpp>

endif

```

include/boost/array.hpp

@@ -44,8 +44,8 @@
 #include <iterator>
 #include <stdexcept>
 #include <boost/assert.hpp>
+#include <boost/core/swap.hpp>
 #include <boost/static_assert.hpp>
-#include <boost/swap.hpp>
 
 #include <boost/throw_exception.hpp>
 #include <algorithm>