Update `dump_schedule` utility (#419) #1315

Job	Run time
valence-tests (windows-latest, default, stable)	39m 33s
valence-tests (macos-latest, default, stable)	21m 17s
valence-tests (ubuntu-latest, default, stable)	18m 21s
extractor-tests (windows-latest)	3m 4s
extractor-tests (macos-latest)	2m 52s
extractor-tests (ubuntu-latest)	2m 4s
valence-fmt (ubuntu-latest, default, nightly-2023-06-20)	35s
valence-clippy (windows-latest, default, stable)	15m 8s
valence-clippy (macos-latest, default, stable)	9m 8s
valence-clippy (ubuntu-latest, default, stable)	6m 47s
valence-docs (windows-latest, default, stable)	14m 46s
valence-docs (macos-latest, default, stable)	8m 52s
valence-docs (ubuntu-latest, default, stable)	6m 5s
	2h 28m 32s

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