Update async-tungstenite requirement from 0.21.0 to 0.22.0

Updates the requirements on [async-tungstenite](https://github.com/sdroege/async-tungstenite) to permit the latest version.
- [Release notes](https://github.com/sdroege/async-tungstenite/releases)
- [Changelog](https://github.com/sdroege/async-tungstenite/blob/master/CHANGELOG.md)
- [Commits](sdroege/async-tungstenite@0.21.0...0.22.0)

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

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

websockets/Cargo.toml

@@ -18,7 +18,7 @@ default = []
 json = ["serde_json", "serde"]
 
 [dependencies]
-async-tungstenite = "0.21.0"
+async-tungstenite = "0.22.0"
 base64 = "0.21.0"
 fastrand = "1.9.0"
 futures-lite = "1.12.0"