disable ci mac as it doesn't support std::format c++20

[Raffaello]

re-enabling when clang will support without any workaround, don't want to waste time on it.

[Raffaello]

https://clang.llvm.org/cxx_status.html

Clang - C++ Programming Language Status

[Raffaello]

Gcc 13 is available in mac, but want to use Clang... (Need Clang v17 at least)

https://github.com/actions/runner-images/blob/main/images/macos/macos-13-Readme.md