COMP: Use dynamic Xcode selection instead of hardcoded version #840

Job	Run time
build-test-documentation (ubuntu-24.04)	35m 15s
build-test-python-superbuild (ubuntu-24.04)	17m 19s
build-test-cxx (ubuntu-24.04)	9m 42s
build-test-cxx (macos-14)	9m 44s
build-test-python-superbuild (windows-2022)	17m 22s
build-test-notebooks (ubuntu-24.04)	2m 1s
build-test-cxx (windows-2022)	9m 46s
build-test-notebooks (macos-14)	2m 10s
build-test-python-superbuild (macos-15)	17m 21s
build-test-notebooks (windows-2022)	3m 31s
	2h 4m 11s

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