Improve resiliency of concurrent use the downloads directory. #1967

Job	Run time
json-schema	1m 5s
format	3m 8s
builds / build (windows-2022, windows-ci)	19m 44s
builds / build (ubuntu-20.04, linux-ci)	10m 0s
builds / build (macos-13, macos-ci)	14m 28s
	48m 25s

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