Upgrade to axum 0.8.x breaks DioxusRouterExt

[jsbaudler]

Problem

After upgrading to axum 0.8.x, the serve_dioxus_application method is no longer found on Router, breaking Dioxus fullstack applications.

Steps To Reproduce

Steps to reproduce the behavior:

• Update axum to 0.8 in Cargo.toml
• Run cargo build on a project using serve_dioxus_application
• Observe compiler error:

error[E0599]: no method named `serve_dioxus_application` found for type `Router` in the current scope
   |
   |     .serve_dioxus_application(ServeConfigBuilder::default(), App);
   |     -^^^^^^^^^^^^^^^^^^^^^^^^ method not found in `Router<_>`

Expected behavior

serve_dioxus_application should remain available after upgrading axum, allowing seamless server setup of Dioxus applications.

Environment:

• Dioxus version: 0.6.1
• Rust version: 1.83.0
• OS info: MacOS
• App platform: web

Announcing axum 0.8.0