itkMathematicalMorphologyEnums.h compile error with GCC 13 on Linux

[Niels_Dekker]

Just submitted:

STYLE: Remove `std::` prefix from uint8_t in MathematicalMorphologyEnums

But that’s just a matter of style, of course. Technically, #include <cstdint> should also work, but within ITK source code, we decided to use those type aliases from “itkIntTypes.h”.