Add sleep to USE_TMP_HOME check for macOS #784

Job	Run time
ruby-versions / Generate Ruby versions	4s
test (3.3)	4m 25s
test (4.0)	4m 54s
test (head)	5m 13s
test (3.4)	5m 37s
test (3.2)	3m 45s
	23m 58s

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