deps: Update async-channel requirement from 1.4.1 to 2.0.0

Updates the requirements on [async-channel](https://github.com/smol-rs/async-channel) to permit the latest version.
- [Release notes](https://github.com/smol-rs/async-channel/releases)
- [Changelog](https://github.com/smol-rs/async-channel/blob/master/CHANGELOG.md)
- [Commits](https://github.com/smol-rs/async-channel/compare/v1.4.1...v2.0.0)

---
updated-dependencies:
- dependency-name: async-channel
  dependency-type: direct:production
...

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Cargo.toml

@@ -23,7 +23,7 @@ futures-lite = { version = "1.11.0", default-features = false }
 slab = "0.4.4"
 
 [dev-dependencies]
-async-channel = "1.4.1"
+async-channel = "2.0.0"
 async-io = "1.1.9"
 criterion = { version = "0.4.0", default-features = false, features = ["cargo_bench_support"] }
 easy-parallel = "3.1.0"