ci: replace deprecated macos-13 runner with macos-15-intel
#345
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The current
macos-13runner (macOS with arch x86_64) is deprecated and no longer maintained. This PR updates the GitHub Actions workflowtest.ymlto replace deprecatedmacos-13withmacos-15-intel, which is the latest Intel-based macOS runner.References
Deprecation notice
According to GitHub Changelog (Sep 19, 2025), all macOS x86_64 runners will be deprecated in Fall 2027. Before that time, we will need to either:
This PR is an interim step to keep CI green until the x86_64 macOS runners are fully retired.