Fix compilation error with undefined shared_ptr

`std::shared_ptr` requires `<memory>` header. Without it being
included explicitly some compilers might fail to compile (while
others might have been using the header indirectly).

Fixes compilation error with GCC 12 on Raspberry Pi OS.

software/libcariboulite/src/CaribouLite.hpp

@@ -20,6 +20,7 @@
 #include <ostream>
 #include <iostream>
 #include <thread>
+#include <memory>
 #include <mutex>
 #include <functional>