Bump actions/download-artifact from 5.0.0 to 6.0.0 #292

Job	Run time
deploy-pr-backend / terraform-plan	46s
deploy-pr-backend / terraform-apply	3m 53s
run-e2e-tests (internal-dev) / wait-for-deployment	16m 4s
run-e2e-tests (internal-dev-sandbox) / wait-for-deployment	15m 55s
run-e2e-tests (internal-dev-sandbox) / e2e-tests	0s
run-e2e-tests (internal-dev-sandbox) / batch-e2e-tests	0s
run-e2e-tests (internal-dev) / e2e-tests	1s
run-e2e-tests (internal-dev) / batch-e2e-tests	1s
	36m 40s

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