Duplicate freetype dependency on harfbuzz is causing problems for build

[horttanainen]

As seen on:
https://github.com/allyourcodebase/SDL_ttf/actions/runs/14289239312/job/40048300645:

/Users/runner/.cache/zig/p/freetype-2.13.2-AAAAAByJAAD7KQxAcdDYidJ3YigvRztfnLmn4rQpvLms/build.zig:1:1: error: file exists in multiple modules
/Users/runner/.cache/zig/p/freetype-2.13.2-AAAAAByJAAD[7](https://github.com/allyourcodebase/SDL_ttf/actions/runs/14289239312/job/40048300645#step:6:8)KQxAcdDYidJ3YigvRztfnLmn4rQpvLms/build.zig:1:1: note: root of module root.@dependencies.freetype-2.13.2-AAAAAByJAAD7KQxAcdDYidJ3YigvRztfnLmn4rQpvLms
/Users/runner/.cache/zig/p/freetype-2.13.2-AAAAAByJAAD7KQxAcdDYidJ3YigvRztfnLmn4rQpvLms/build.zig:1:1: note: root of module [email protected][8](https://github.com/allyourcodebase/SDL_ttf/actions/runs/14289239312/job/40048300645#step:6:9)89d27762282f473b5f9cb9a7e2b429bcb9acbd9172a6e2a1e4

I am not entirely sure on how to go about this. I am not very familiar with zig build system. Removing harfbuzz altogether fixes the problem but surely there is a better fix?