CI-windows

CI-unixish.yml: added `macos-15` #661

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Run time

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Job	Run time
build (windows-2019, Release)	1m 38s
build (windows-2019, Debug)	1m 33s
build (windows-2022, Release)	1m 54s
build (windows-2022, Debug)	1m 50s
	6m 55s