Bump actions/checkout from 5.0.0 to 6.0.0 #5927

Job	Run time
build_linux (3.11)	30m 11s
build_linux (3.10)	30m 49s
build_linux (3.14)	29m 49s
build_windows (3.11)	42m 15s
build_windows (3.14)	45m 56s
build_windows (3.13)	40m 11s
build_linux (3.12)	30m 45s
build_windows (3.12)	46m 37s
build_windows (3.10)	47m 15s
build_linux (3.13)	29m 39s
array-api-conformity (3.10, false, ubuntu-22.04)	5m 4s
test_linux (3.10, false, ubuntu-22.04)	10m 14s
test_linux (3.12, false, ubuntu-22.04)	11m 29s
test_linux (3.11, false, ubuntu-22.04)	10m 38s
test_linux (3.13, false, ubuntu-22.04)	12m 2s
test_linux (3.14, false, ubuntu-22.04)	10m 21s
test_examples_linux (3.11, false, ubuntu-22.04)	11m 59s
upload_linux	0s
test_windows (3.10, false, windows-latest)	15m 2s
test_windows (3.11, false, windows-latest)	14m 1s
test_windows (3.13, false, windows-latest)	14m 48s
test_windows (3.12, false, windows-latest)	14m 47s
test_windows (3.14, false, windows-latest)	14m 59s
upload_windows	0s
Clean up anaconda packages	0s
	8h 38m 51s

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