Update Rust crate tokio-tungstenite to 0.27

Author: oxide-renovate[bot]

Cargo.toml

@@ -33,7 +33,7 @@ toml = "0.8"
 propolis-client = { git = "https://github.com/oxidecomputer/propolis", rev = "02fdf06bb279fc1b1393f993b90cbe84b7e9f281" }
 libc = "0.2"
 tokio = { version = "1.45.1", features = ["full"] }
-tokio-tungstenite = "0.21"
+tokio-tungstenite = "0.27"
 futures = "0.3"
 clap = { version = "4.5.40", features = ["color", "derive"] }
 tabwriter = { version = "1", features = ["ansi_formatting"] }