MacOS: Dual version of Swift compiler

[kassane]

https://github.com/kassane/CxxInterop-tests/actions/runs/7090390472/job/19297220538#step:4:1

During the setup-swift installation process it is noticed that there is another older version of the Swiftc compiler installed on macos-runner conflicting in the project build through CMake.

https://github.com/kassane/CxxInterop-tests/actions/runs/7090390472/job/19297220538#step:8:114

-- Configuring incomplete, errors occurred!
  Bidirectional C++ Interop requires Swift 5.9 or greater.  Have 5.7.2

[fwal]

Hmm, it should've switched the selected version over, haven't tried using cmake though 🤔

Is it still causing issues?

[kassane]

Yeah!
https://github.com/kassane/CxxInterop-tests/actions/runs/7239698283/job/19721861724#step:8:120

-- The CXX compiler identification is AppleClang 14.0.0.14000029
-- The Swift compiler identification is Apple 5.7.2

Tried add set(CMAKE_Swift_COMPILER_VERSION 5.9) and it didn't work.