Test CLI

ci: bump upload/download artifact `v4` [2/2] & `actions-ref` optional #65

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Run time

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Job	Run time
test-cli (ubuntu-latest, 3.10)	11s
test-cli (macos-latest, 3.10)	25s
test-cli (windows-latest, 3.10)	38s
cli-guardian	1s
	1m 15s