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Add `prepareDependencies` #708

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Run time

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Job	Run time
Ubuntu (Swift 5.10)	2m 10s
macOS (debug, 15.4)	1m 29s
macOS (debug, 16.0)	1m 46s
macOS (release, 15.4)	1m 42s
macOS (release, 16.0)	1m 47s
	8m 54s