Update hashbrown requirement from 0.14.5 to 0.15.1 #708

Job	Run time
build with wasm-pack	37s
cargo check	37s
Check cargo fmt	41s
cargo test (macos)	18s
cargo test (macos-aarch64)	18s
Verify MSRV (Min Supported Rust Version)	4m 34s
Verify Vendored Code	38s
cargo test (win64)	1m 26s
verify benchmark results (amd64)	0s
Run sqllogictest with Postgres runner	0s
cargo examples (amd64)	0s
cargo doc	0s
cargo test pyarrow (amd64)	0s
check Cargo.toml formatting	0s
clippy	0s
cargo test hash collisions (amd64)	0s
cargo test (amd64)	0s
cargo test datafusion-cli (amd64)	0s
cargo test doc (amd64)	0s
check configs.md is up-to-date	0s
	9m 9s

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