Build error on GCC 13 due to missing headers

[yklcs]

GCC 13 does not implicitly include cstdint, which breaks builds.

diff-gaussian-rasterization/cuda_rasterizer/rasterizer_impl.h(24): error: namespace "std" has no member "uintptr_t"
          std::size_t offset = (reinterpret_cast<std::uintptr_t>(chunk) + alignment - 1) & ~(alignment - 1);

[yklcs]

Simple fix: graphdeco-inria/diff-gaussian-rasterization#49

#715 seems to also include the same problem.