Add a couple of missing #include directives

[musicinmybrain]

In src/internal/math, std::numeric_limits is used from <limits>, and std::max and std::min are used from <algorithm>. Include these standard-library headers where they are used rather than relying on their inclusion by implicit or indirect means.

Fixes failure to compile on GCC 14.0.1 in Fedora Rawhide.