switch from XCode 15.4 to 15.1 #9

Job	Run time
Ubuntu / Release / gcc	13m 57s
macOS / Release / homebrew-clang	7m 11s
Ubuntu / Debug / gcc	17m 23s
Windows / Release / cl	8m 9s
macOS / Debug / homebrew-clang	6m 8s
Ubuntu / Release / clang	17m 50s
Windows / Release / clang	8m 12s
macOS / Release / system-clang	7m 5s
Ubuntu / Debug / clang	13m 17s
Windows / Release / clang-cl	6m 16s
macOS / Debug / system-clang	5m 52s
Windows / Debug / cl	12m 23s
Windows / Debug / clang	11m 13s
Windows / Debug / clang-cl	10m 58s
	2h 25m 54s

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