ci: use setup-xcode to install latest stable version #5

Job	Run time
Linux / dev-build (gcc-10, Debug)	1m 44s
Linux / dev-build (gcc-10, Release)	1m 53s
MacOS / dev-build (Unix Makefiles, Debug)	1m 12s
Linux / dev-build (gcc-11, Debug)	1m 22s
MacOS / dev-build (Unix Makefiles, Release)	57s
Linux / dev-build (gcc-11, Release)	1m 4s
MacOS / dev-build (Xcode, Debug)	53s
Linux / dev-build (gcc-12, Debug)	1m 53s
MacOS / dev-build (Xcode, Release)	57s
Linux / dev-build (gcc-12, Release)	1m 15s
Linux / dev-build (clang-14, Debug)	2m 2s
Linux / dev-build (clang-14, Release)	2m 14s
Windows / dev-build (Ninja, Debug)	1m 35s
Linux / dev-build (clang-15, Debug)	2m 0s
Windows / dev-build (Ninja, Release)	1m 33s
Linux / dev-build (clang-15, Release)	1m 30s
Windows / dev-build (NMake Makefiles, Debug)	1m 30s
Linux / dev-build (clang-16, Debug)	1m 48s
Windows / dev-build (NMake Makefiles, Release)	1m 21s
Linux / dev-build (clang-16, Release)	1m 50s
Windows / dev-build (Visual Studio 17 2022, Debug)	1m 19s
Windows / dev-build (Visual Studio 17 2022, Release)	1m 25s
	33m 17s

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