Bump actions/download-artifact from 1 to 4.1.7 in /.github/workflows #6197

Job	Run time
Black Python code format	22s
Flake8	14s
Check that the source code is compliant	1m 3s
Bazel code format	7s
Clang C++ code format	12s
Notebook format	20s
Check that we can build the docs	1m 56s
Notebook lint	10s
Check that the pre-commit works	22s
Run the cpu tests in a small python docker image	10m 22s
Fast build to run python-only tests	4m 45s
Valid build files	2m 2s
	21m 55s

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