Improve resiliency of concurrent use the downloads directory. #1973

Job	Run time
format	3m 44s
json-schema	1m 0s
builds / build (windows-2022, windows-ci)	5m 6s
builds / build (ubuntu-20.04, linux-ci)	9m 44s
builds / build (macos-13, macos-ci)	13m 14s
	32m 48s

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