Bump hashbrown from 0.15.0 to 0.15.2 (#590) #1612

Job	Run time
formatting	20s
cargo check (msrv) (windows-latest)	1m 23s
cargo check (msrv) (wasm32)	35s
cargo check (msrv) (macos-latest)	38s
cargo clippy (wasm32)	1m 1s
cargo clippy (windows-latest)	2m 23s
cargo check (msrv) (ubuntu-latest)	1m 15s
cargo clippy (macos-latest)	1m 1s
cargo test (windows-latest)	1m 53s
cargo clippy (ubuntu-latest)	1m 42s
cargo test (wasm32)	41s
cargo test (macos-latest)	1m 6s
cargo test (ubuntu-latest)	1m 11s
compare snapshots (windows-latest)	1m 44s
cargo doc (windows-latest)	1m 38s
compare snapshots (macos-latest)	34s
cargo doc (macos-latest)	34s
cargo doc (ubuntu-latest)	1m 4s
typos	6s
compare snapshots (ubuntu-latest)	1m 0s
	21m 49s

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