Use macOS 14 in CI #929

Job	Run time
windows (32, windows-2019)	10m 0s
unix (ubuntu-20.04, g++, make)	4m 45s
macos-static	43s
windows (32, windows-2022)	4m 51s
windows-mingw-build (32)	51s
unix (ubuntu-20.04, g++, cmake)	4m 35s
windows (64, windows-2019)	5m 50s
windows-mingw-build (64)	1m 10s
unix (ubuntu-20.04, clang++, make)	5m 23s
windows (64, windows-2022)	4m 37s
unix (ubuntu-20.04, clang++, cmake)	5m 19s
unix (ubuntu-22.04, g++, make)	4m 54s
unix (ubuntu-22.04, g++, cmake)	5m 12s
unix (ubuntu-22.04, clang++, make)	3m 51s
unix (ubuntu-22.04, clang++, cmake)	3m 51s
unix (macos-14, clang++, make)	2m 20s
unix (macos-14, clang++, cmake)	35s
windows-mingw-testing (windows-2019, 32)	6m 26s
windows-mingw-testing (windows-2019, 64)	4m 15s
windows-mingw-testing (windows-2022, 32)	5m 16s
windows-mingw-testing (windows-2022, 64)	6m 33s
	1h 31m 17s

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