Actually call gc #569

Job	Run time
rust_ci (macos-latest, stable)	55s
rust_ci (macos-latest, beta)	57s
rust_ci (windows-latest, beta)	2m 40s
rust_ci (windows-latest, stable)	2m 30s
rust_ci (ubuntu-latest, stable)	52s
rust_ci (ubuntu-latest, beta)	56s
	8m 50s

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