Bump hashbrown from 0.15.0 to 0.15.2 #233

Job	Run time
sanity-checks	22s
msrv	37s
x86_64-unknown-linux-musl / stable	2m 5s
x86_64-unknown-linux-musl / nightly	2m 1s
aarch64-unknown-linux-musl / stable	2m 54s
aarch64-unknown-linux-musl / nightly	2m 27s
arm-unknown-linux-musleabi / stable	2m 29s
arm-unknown-linux-musleabi / nightly	2m 24s
i686-unknown-linux-musl / stable	2m 2s
i686-unknown-linux-musl / nightly	2m 9s
riscv64gc-unknown-linux-gnu / stable	2m 12s
riscv64gc-unknown-linux-gnu / nightly	2m 24s
aarch64-pc-windows-msvc / stable	3m 19s
aarch64-pc-windows-msvc / nightly	3m 23s
i686-pc-windows-msvc / stable	3m 31s
i686-pc-windows-msvc / nightly	3m 13s
x86_64-pc-windows-msvc / stable	4m 22s
x86_64-pc-windows-msvc / nightly	3m 40s
x86_64-apple-darwin / stable	1m 44s
x86_64-apple-darwin / nightly	1m 59s
aarch64-apple-darwin / stable	1m 15s
aarch64-apple-darwin / nightly	1m 39s
	52m 11s

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