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馃懛 ci: run macOS jobs on macos-26 - #3244
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macos-15 no longer matches macos-latest now that GitHub promoted macos-26 (arm64) to that label. Moved both the interpreter matrix and the brew@ Python jobs onto macos-26 to track the same OS the rest of our users get by default.
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GitHub promoted
macos-26to themacos-latestlabel on its arm64 hosted runners, somacos-15, still pinned incheck.yaml, no longer tracks what most users get by default when they run on the newest macOS.macos-26is a stable release image, not a preview, unlikeubuntu-26.04, which the runner-images repo still marks preview and isn't a safe swap yet.This moves both the main interpreter matrix and the
brew@Python jobs frommacos-15tomacos-26. Windows already trackswindows-latestviawindows-2025-vs2026, and Ubuntu stays onubuntu-24.04untilubuntu-26.04leaves preview.