Use macOS 14 in CI #931

Job	Run time
windows (32, windows-2019)	5m 50s
windows-mingw-build (32)	1m 0s
macos-static	2m 31s
windows (32, windows-2022)	6m 35s
unix (ubuntu-20.04, g++, make)	4m 38s
windows-mingw-build (64)	1m 21s
windows (64, windows-2019)	5m 38s
unix (ubuntu-20.04, g++, cmake)	4m 30s
windows (64, windows-2022)	6m 13s
unix (ubuntu-20.04, clang++, make)	5m 7s
unix (ubuntu-20.04, clang++, cmake)	4m 39s
unix (ubuntu-22.04, g++, make)	5m 0s
unix (ubuntu-22.04, g++, cmake)	5m 14s
unix (ubuntu-22.04, clang++, make)	3m 38s
unix (ubuntu-22.04, clang++, cmake)	4m 1s
unix (macos-14, clang++, make)	6m 32s
unix (macos-14, clang++, cmake)	50s
windows-mingw-testing (windows-2019, 32)	4m 49s
windows-mingw-testing (windows-2019, 64)	4m 23s
windows-mingw-testing (windows-2022, 32)	4m 10s
windows-mingw-testing (windows-2022, 64)	5m 22s
	1h 32m 1s

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