Update dashmap requirement from 5 to 6 #576

Job	Run time
format	12s
Clippy	48s
cargo-build (aarch64-linux-android, ubuntu-22.04)	3m 7s
cargo-test (ubuntu-22.04, default, stable)	3m 41s
cargo-build (armv7-linux-androideabi, ubuntu-22.04)	2m 57s
cargo-test (macos-12, default, stable)	6m 59s
cargo-build (i686-linux-android, ubuntu-22.04)	2m 54s
cargo-test (windows-2019, default, stable)	8m 23s
cargo-build (x86_64-linux-android, ubuntu-22.04)	2m 53s
cargo-test (ubuntu-22.04, beta)	4m 43s
cargo-build (x86_64-unknown-linux-musl, ubuntu-22.04)	2m 36s
cargo-test (ubuntu-22.04, blocking)	4m 41s
cargo-build (aarch64-apple-ios, macos-12)	5m 11s
cargo-test (ubuntu-22.04, blocking,beta)	4m 52s
cargo-test (ubuntu-22.04, tls-rustls --no-default-features)	4m 43s
cargo-test (ubuntu-22.04, tls-vendored-openssl --no-default-features)	5m 17s
cargo-test (ubuntu-22.04, beta, default)	3m 42s
cargo-test (ubuntu-22.04, 1.74.0, default)	4m 46s
	1h 12m 25s

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