Bump hashbrown from 0.15.2 to 0.15.3 #548

Job	Run time
rust_ci (macos-latest, stable)	1m 32s
rust_ci (macos-latest, beta)	1m 19s
rust_ci (macos-latest, nightly)	1m 20s
rust_ci (ubuntu-latest, stable)	57s
rust_ci (ubuntu-latest, beta)	1m 11s
rust_ci (windows-latest, nightly)	1m 58s
rust_ci (windows-latest, stable)	2m 29s
rust_ci (windows-latest, beta)	2m 16s
rust_ci (ubuntu-latest, nightly)	1m 9s
	14m 11s

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