Bump actions/setup-python from 5 to 6 #5769

Job	Run time
build_linux (3.9)	33m 51s
build_linux (3.11)	35m 51s
build_linux (3.12)	36m 36s
build_linux (3.10)	35m 10s
build_linux (3.13)	34m 36s
build_windows (3.12)	38m 42s
build_windows (3.13)	38m 2s
build_windows (3.9)	38m 23s
build_windows (3.11)	37m 27s
build_windows (3.10)	40m 5s
test_examples_linux (3.11, false, ubuntu-22.04)	8m 20s
array-api-conformity (3.10, false, ubuntu-22.04)	5m 27s
test_linux (3.10, false, ubuntu-22.04)	10m 59s
test_linux (3.13, false, ubuntu-22.04)	10m 18s
test_linux (3.11, false, ubuntu-22.04)	10m 36s
test_linux (3.9, false, ubuntu-22.04)	10m 20s
test_linux (3.12, false, ubuntu-22.04)	10m 46s
test_windows (3.9, false, windows-latest)	13m 56s
test_windows (3.10, false, windows-latest)	16m 34s
test_windows (3.12, false, windows-latest)	13m 51s
test_windows (3.13, false, windows-latest)	15m 25s
test_windows (3.11, false, windows-latest)	14m 11s
upload_linux	-1s
upload_windows	0s
Clean up anaconda packages	-1s
	8h 29m 24s

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