build(deps): update dashmap requirement from 5.5.0 to 6.0.0 #2616

Job	Run time
cargo check	3m 31s
cargo test (macos)	8m 57s
cargo test (win64)	32m 13s
build with wasm-pack	2m 9s
Check cargo fmt	47s
cargo test (macos-aarch64)	20s
Verify MSRV (Min Supported Rust Version)	6m 28s
Verify Vendored Code	52s
cargo test (amd64)	0s
cargo test datafusion-cli (amd64)	0s
cargo examples (amd64)	0s
cargo test doc (amd64)	0s
clippy	0s
cargo test hash collisions (amd64)	0s
Run sqllogictest with Postgres runner	0s
cargo test pyarrow (amd64)	0s
verify benchmark results (amd64)	0s
check Cargo.toml formatting	0s
check configs.md is up-to-date	0s
cargo doc	0s
	55m 17s

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