Bump hashbrown from 0.15.0 to 0.15.2 #1610

Job	Run time
formatting	18s
cargo test (windows-latest)	2m 10s
cargo check (msrv) (wasm32)	30s
cargo test (macos-latest)	42s
cargo check (msrv) (windows-latest)	2m 12s
cargo check (msrv) (macos-latest)	40s
cargo test (ubuntu-latest)	1m 18s
cargo clippy (windows-latest)	3m 1s
cargo check (msrv) (ubuntu-latest)	1m 24s
cargo clippy (wasm32)	59s
cargo clippy (macos-latest)	1m 2s
cargo clippy (ubuntu-latest)	2m 32s
compare snapshots (windows-latest)	1m 50s
cargo doc (windows-latest)	1m 47s
compare snapshots (macos-latest)	53s
cargo test (wasm32)	37s
cargo doc (macos-latest)	36s
typos	3s
compare snapshots (ubuntu-latest)	59s
cargo doc (ubuntu-latest)	59s
	24m 32s

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