Move from macos-13 to macos-15-intel following deprecation #195

Job	Run time
get_version	3s
build-and-run-tests-macos (macos-14)	38m 11s
build-and-run-tests-ubuntu	33m 54s
build-and-run-tests-windows	58m 2s
build-and-run-tests-macos (macos-15-intel)	1h 21m 13s
get_version	3s
build-and-run-tests-macos (macos-15-intel)	1h 6m 21s
build-and-run-tests-ubuntu	33m 54s
build-and-run-tests-windows	58m 2s
build-and-run-tests-macos (macos-14)	38m 11s
	6h 47m 54s

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