Bump actions/setup-python from 6 to 7 #24287

Job	Run time
build (Release, Windows_2022_qt_610, windows-2022, cl, cl, true, true, true, true, false, bootstr...	10m 17s
build (Release, Ubuntu 24.04 gcc, ubuntu-24.04, gcc-14, g++-14, true, true, true, false, true, bo...	6m 54s
build (Release, Ubuntu 24.04 clang-19, ubuntu-24.04, clang-19, clang++-19, true, true, false, fal...	4m 22s
Upload release to PyPI	-1s
	21m 32s

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