graphics/inkscape: partially pull in two upstream changes

Both changes are for removing std::unary_function and std::binary_function,
which are deprecated in C++17 and error in clang 16:

• https://gitlab.com/inkscape/inkscape/-/merge_requests/4463 (partial)
• https://gitlab.com/inkscape/inkscape/-/merge_requests/4483 (full)

These involve code refactorings where functional changes can exist
so bump PORTREVISION.

Event: ARRL/RAC Field Day 2023