boost-1.86.0

Tested on Zig version: 0.13.0 & 0.14.0-dev

Based on: https://www.boost.org/users/history/version_1_86_0.html

$ zig fetch --save=boost https://github.com/allyourcodebase/boost-libraries-zig/archive/refs/tags/boost-1.86.0.tar.gz