fix(panel): downgrade gloo-net to 0.4.0 to fix duplicate symbols

Author: Akinator31

Cargo.lock

@@ -9,7 +9,7 @@ rustmail_types = { path = "../rustmail_types" }
 yew = { version = "0.21", features = ["csr"] }
 yew-router = "0.18.0"
 wasm-bindgen-futures = "0.4.50"
-gloo-net = "0.6.0"
+gloo-net = "0.4.0"
 gloo-utils = "0.2.0"
 web-sys = { version = "0.3.77", features = ["HtmlSelectElement"] }
 serde_json = "1.0.145"