Bump hashbrown from 0.15.0 to 0.15.2 #238

Job	Run time
sanity-checks	21s
msrv	17s
x86_64-unknown-linux-musl / stable	1m 53s
x86_64-unknown-linux-musl / nightly	2m 18s
aarch64-unknown-linux-musl / stable	2m 4s
aarch64-unknown-linux-musl / nightly	2m 39s
arm-unknown-linux-musleabi / stable	2m 51s
arm-unknown-linux-musleabi / nightly	2m 33s
i686-unknown-linux-musl / stable	1m 40s
i686-unknown-linux-musl / nightly	1m 53s
riscv64gc-unknown-linux-gnu / stable	44s
riscv64gc-unknown-linux-gnu / nightly	1m 56s
aarch64-pc-windows-msvc / stable	2m 28s
aarch64-pc-windows-msvc / nightly	2m 42s
i686-pc-windows-msvc / stable	4m 3s
i686-pc-windows-msvc / nightly	1m 13s
x86_64-pc-windows-msvc / stable	3m 19s
x86_64-pc-windows-msvc / nightly	3m 4s
x86_64-apple-darwin / stable	1m 36s
x86_64-apple-darwin / nightly	1m 43s
aarch64-apple-darwin / stable	21s
aarch64-apple-darwin / nightly	1m 9s
	42m 47s

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