Bump actions/checkout from 6.0.2 to 6.0.3 #6314

Job	Run time
build_windows (3.12)	9m 39s
build_linux (3.10)	5m 53s
build_windows (3.10)	8m 55s
build_windows (3.13)	8m 14s
build_windows (3.14)	7m 49s
build_linux (3.14)	5m 57s
build_linux (3.13)	5m 27s
build_linux (3.11)	5m 39s
build_windows (3.11)	7m 56s
build_linux (3.12)	8m 6s
test_examples_linux (3.14, false, ubuntu-latest)	5m 13s
test_linux (3.11, false, ubuntu-latest)	2m 15s
test_linux (3.14, false, ubuntu-latest)	2m 53s
test_linux (3.10, false, ubuntu-latest)	2m 18s
test_linux (3.13, false, ubuntu-latest)	2m 36s
test_linux (3.12, false, ubuntu-latest)	2m 37s
test_windows (3.13, false, windows-latest)	3m 49s
test_windows (3.10, false, windows-latest)	4m 38s
test_windows (3.11, false, windows-latest)	3m 26s
test_windows (3.14, false, windows-latest)	4m 18s
test_windows (3.12, false, windows-latest)	4m 4s
upload_linux	0s
upload_windows	-1s
Clean up anaconda packages	0s
	1h 51m 41s

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