Update async-net requirement from 1 to 2

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

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

Signed-off-by: dependabot[bot] <[email protected]>

Cargo.toml

@@ -40,7 +40,7 @@ windows-sys = { version = "0.48.0", features = ["Win32_Foundation"] }
 
 [dev-dependencies]
 async-channel = "2"
-async-net = "1"
+async-net = "2"
 blocking = "1"
 criterion = { version = "0.4", default-features = false, features = ["cargo_bench_support"] }
 getrandom = "0.2.7"