Add macOS 14 build job

## Summary - add macOS 14 job to GitHub Actions workflow ## Testing - `actionlint .github/workflows/build.yml` *(fails: label "debian-10" is unknown)* - `actionlint -ignore 'label "debian-10" is unknown' -ignore 'label "macos-13" is unknown' .github/workflows/build.yml` ------ https://chatgpt.com/codex/tasks/task_e_68b30c24518c8325bf6d77feb3d40507