We use the GitHub Actions macos-15-intel runner for testing on macOS / x64. GitHub has indicated that the macOS / x64 architecture is deprecated and will no longer be supported after the macos-15 runners are retired in the fall of 2027. [1]

We will need to remove the macOS / x64 build from our GHA scripts at that time.

[1] https://github.blog/changelog/2025-09-19-github-actions-macos-13-runner-image-is-closing-down/#notice-of-macos-x86_64-intel-architecture-deprecation