iox-eclipse-iceoryx#2301 Use fixed width type for relative pointer of…

…fset

iceoryx_hoofs/memory/include/iox/relative_pointer.hpp

@@ -67,7 +67,7 @@ class RelativePointer final
 {
  public:
  using ptr_t = T*;
- using offset_t = std::uintptr_t;
+ using offset_t = std::uint64_t;
 
  /// @brief Default constructs a RelativePointer as a logical nullptr
  RelativePointer() noexcept = default;