update gloo-net version

update the gloo-net version on the Cargo.toml example to the latest one.

website/docs/tutorial/index.mdx

@@ -505,7 +505,7 @@ Let's update the dependencies in `Cargo.toml` file:
 
 ```toml title="Cargo.toml"
 [dependencies]
-gloo-net = "0.2"
+gloo-net = "0.4"
 serde = { version = "1.0", features = ["derive"] }
 wasm-bindgen-futures = "0.4"
 ```