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GitHub retires the macos-14 image on 2026-11-02 (brownouts from 2026-10-05). Xcode 15 is not available on any remaining hosted runner, so drop the macos-14 job and its documented compilers. Also test the Xcode versions that the images provide but CI did not use (26.1.1-26.3 on macos-15, 26.4.1-26.6 on a new macos-26 job), and pin GCC 16 explicitly next to gcc:latest. Signed-off-by: Niels Lohmann <mail@nlohmann.me>