Update async-channel requirement from 1.4.2 to 2.3.1

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](smol-rs/async-channel@v1.4.2...v2.3.1)

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

Signed-off-by: dependabot[bot] <support@github.com>

Cargo.toml

@@ -32,7 +32,7 @@ text-decoding = ["encoding_rs", "mime"]
 unstable-interceptors = []
 
 [dependencies]
-async-channel = "1.4.2"
+async-channel = "2.3.1"
 castaway = "0.1.1"
 crossbeam-utils = ">=0.7.0, <0.9.0"
 curl = "0.4.36"