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Move `withTmpFile` next to `withTmpDir` #8977

Job	Run time
Ruby analysis (macos-latest, linked)	1m 5s
Ruby analysis (macos-latest, nightly-latest)	1m 1s
Ruby analysis (macos-latest, default)	1m 10s
Ruby analysis (ubuntu-latest, linked)	45s
Ruby analysis (ubuntu-latest, default)	42s
Ruby analysis (ubuntu-latest, nightly-latest)	33s
	5m 16s