Failure with macos-14

[iamsergio]

With macos-14, I get:

error: externally-managed-environment

× This environment is externally managed
╰─> To install Python packages system-wide, try brew install
    xyz, where xyz is the package you are trying to
    install.

Can you add macos-14 to the ci.yml matrix ? Let's see if it's repo here as well

[dacap]

Just in case we've created a fork of this action in https://github.com/aseprite/get-ninja to fix this problem and just downloads the ninja binary from its repository (instead of using pip3).