Use macOS 14 in CI #936

Job	Run time
macos-static	1m 18s
windows-mingw-build (32)	56s
windows (32, windows-2019)	3m 52s
unix (ubuntu-20.04, g++, make)	4m 20s
windows-mingw-build (64)	51s
windows (32, windows-2022)	5m 57s
unix (ubuntu-20.04, g++, cmake)	5m 5s
windows (64, windows-2019)	5m 29s
unix (ubuntu-20.04, clang++, make)	4m 52s
windows (64, windows-2022)	5m 19s
unix (ubuntu-20.04, clang++, cmake)	5m 11s
unix (ubuntu-22.04, g++, make)	5m 9s
unix (ubuntu-22.04, g++, cmake)	4m 50s
unix (ubuntu-22.04, clang++, make)	3m 20s
unix (ubuntu-22.04, clang++, cmake)	3m 17s
unix (macos-14, clang++, make)	6m 7s
unix (macos-14, clang++, cmake)	7m 49s
windows-mingw-testing (windows-2019, 32)	4m 29s
windows-mingw-testing (windows-2019, 64)	4m 34s
windows-mingw-testing (windows-2022, 32)	4m 15s
windows-mingw-testing (windows-2022, 64)	3m 12s
	1h 30m 12s

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