Bump hashbrown from 0.15.5 to 0.17.0 #688

Job	Run time
rust_ci (windows-latest, stable)	6m 22s
rust_ci (ubuntu-latest, beta)	1m 26s
rust_ci (macos-latest, beta)	1m 35s
rust_ci (ubuntu-latest, stable)	1m 25s
rust_ci (macos-latest, stable)	1m 44s
rust_ci (windows-latest, beta)	3m 1s
	15m 33s

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