Bump hashbrown from 0.15.0 to 0.15.2 #234

Job	Run time
sanity-checks	17s
msrv	21s
x86_64-unknown-linux-musl / stable	2m 1s
x86_64-unknown-linux-musl / nightly	1m 50s
aarch64-unknown-linux-musl / stable	2m 27s
aarch64-unknown-linux-musl / nightly	2m 31s
arm-unknown-linux-musleabi / stable	1m 57s
arm-unknown-linux-musleabi / nightly	2m 46s
i686-unknown-linux-musl / stable	1m 54s
i686-unknown-linux-musl / nightly	1m 42s
riscv64gc-unknown-linux-gnu / stable	55s
riscv64gc-unknown-linux-gnu / nightly	2m 34s
aarch64-pc-windows-msvc / stable	3m 30s
aarch64-pc-windows-msvc / nightly	2m 43s
i686-pc-windows-msvc / stable	4m 5s
i686-pc-windows-msvc / nightly	1m 42s
x86_64-pc-windows-msvc / stable	4m 34s
x86_64-pc-windows-msvc / nightly	3m 24s
x86_64-apple-darwin / stable	1m 24s
x86_64-apple-darwin / nightly	1m 46s
aarch64-apple-darwin / stable	25s
aarch64-apple-darwin / nightly	1m 9s
	45m 57s

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