Bump actions/download-artifact from 7 to 8 #2334

Job	Run time
should run ci	8s
cache-pixi-lock	8s
build-and-upload-nightly-parcels	1m 20s
Unit tests: ubuntu \| pixi run -e test-py313 tests	4m 3s
Unit tests: ubuntu \| pixi run -e test-py311 tests	4m 8s
Unit tests: ubuntu \| pixi run -e test-minimum tests	3m 44s
Unit tests: ubuntu \| pixi run -e test tests	3m 2s
Unit tests: windows \| pixi run -e test tests	6m 3s
TypeChecking: pixi run typing	0s
Integration: ${{ matrix.os }} \| pixi run -e ${{ matrix.pixi-environment }} tests-notebooks	0s
merge-test-artifacts	0s
	22m 36s

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