Use macOS 14 in CI #930

Job	Run time
macos-static	39s
windows-mingw-build (32)	1m 23s
unix (ubuntu-20.04, g++, make)	4m 27s
windows (32, windows-2019)	6m 43s
windows-mingw-build (64)	1m 38s
unix (ubuntu-20.04, g++, cmake)	6m 39s
windows (32, windows-2022)	7m 24s
unix (ubuntu-20.04, clang++, make)	4m 46s
windows (64, windows-2019)	6m 33s
unix (ubuntu-20.04, clang++, cmake)	5m 0s
windows (64, windows-2022)	6m 7s
unix (ubuntu-22.04, g++, make)	5m 29s
unix (ubuntu-22.04, g++, cmake)	5m 5s
unix (ubuntu-22.04, clang++, make)	3m 30s
unix (ubuntu-22.04, clang++, cmake)	3m 19s
unix (macos-14, clang++, make)	2m 57s
unix (macos-14, clang++, cmake)	1m 4s
windows-mingw-testing (windows-2019, 32)	5m 34s
windows-mingw-testing (windows-2019, 64)	5m 35s
windows-mingw-testing (windows-2022, 32)	4m 47s
windows-mingw-testing (windows-2022, 64)	4m 22s
	1h 33m 1s

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