Update async-tungstenite requirement from 0.27 to 0.28

Updates the requirements on [async-tungstenite](https://github.com/sdroege/async-tungstenite) to permit the latest version.
- [Changelog](https://github.com/sdroege/async-tungstenite/blob/main/CHANGELOG.md)
- [Commits](sdroege/async-tungstenite@0.27.0...0.28.0)

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

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

Cargo.toml

@@ -32,7 +32,7 @@ anyhow = "1"
 async-dup = "1"
 async-h1 = "2"
 async-native-tls = "0.5"
-async-tungstenite = { version = "0.27", features = ["async-native-tls"] }
+async-tungstenite = { version = "0.28", features = ["async-native-tls"] }
 ctrlc = "3"
 doc-comment = "0.3"
 futures = "0.3"