chore: bump crossbeam-channel to 0.5.8 (#9592)

Versions 0.5.1 - 0.5.7 were yanked due to a race condition. See
[changelog](https://github.com/crossbeam-rs/crossbeam/blob/master/crossbeam-channel/CHANGELOG.md#version-058)
and [crates.io](https://crates.io/crates/crossbeam-channel/versions) and
[PR with the fix](crossbeam-rs/crossbeam#972).

Author: jakmeier

Cargo.lock

@@ -125,7 +125,7 @@ conqueue = "0.4.0"
 cpu-time = "1.0"
 criterion = { version = "0.3.5", default_features = false, features = ["html_reports", "cargo_bench_support"] }
 crossbeam = "0.8"
-crossbeam-channel = "0.5"
+crossbeam-channel = "0.5.8"
 crossbeam-queue = "0.3.8"
 csv = "1.2.1"
 curve25519-dalek = "3"