CI: remove unsupported Xcode version #539

Job	Run time
build (ubuntu-22.04, g++-12, gcc-12, g++-12)	1h 0m 10s
build (ubuntu-22.04, g++-12, gcc-12, g++-12)	13m 43s
build (ubuntu-20.04, g++-9, gcc-9, g++-9)	1h 0m 13s
build (ubuntu-20.04, g++-9, gcc-9, g++-9)	13m 44s
build (ubuntu-22.04, clang-14, clang-14, clang++-14)	1h 0m 12s
build (ubuntu-22.04, clang-14, clang-14, clang++-14)	11m 59s
build (ubuntu-20.04, clang-9, clang-9, clang++-9, -fno-builtin)	1h 0m 14s
build (ubuntu-20.04, clang-9, clang-9, clang++-9, -fno-builtin)	8m 38s
build (macos-13, Xcode_14.3)	1h 0m 11s
build (macos-13, Xcode_14.3)	15m 53s
build (macos-12, Xcode_14.2)	1h 0m 13s
build (macos-12, Xcode_14.2)	26m 12s
	7h 31m 22s

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