Build: Bump actions/download-artifact from 7 to 8 #7912

Job	Run time
cibw-dev-env-smoke-test	22s
lint-and-unit-test (3.10)	2m 51s
integration-test-s3	1m 1s
integration-test-adls	1m 8s
integration-test	10m 44s
integration-test-gcs	1m 12s
lint-and-unit-test (3.13)	2m 49s
lint-and-unit-test (3.11)	2m 37s
lint-and-unit-test (3.12)	2m 45s
integration-coverage-report	32s
	26m 1s

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