Axum 0.8 introduces breaking trait change for the service

[dlorddd]

Setting up axum-analytics using the latest Axum v0.8.1 causes the following error:

error[E0277]: the trait bound `AnalyticsMiddleware<Route>: Service<axum::http::Request<axum::body::Body>>` is not satisfied
   --> src/main.rs:157:16
    |
157 |         .layer(Analytics::new(settings.analytics_api_key.clone()))
    |          ----- ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `Service<axum::http::Request<axum::body::Body>>` is not implemented for `AnalyticsMiddleware<Route>`
    |          |
    |          required by a bound introduced by this call
    |
    = help: the trait `Service<axum::http::Request<axum_core::body::Body>>` is implemented for `AnalyticsMiddleware<S>`
note: required by a bound in `Router::<S>::layer`
   --> /usr/local/cargo/registry/src/index.crates.io-1949cf8c6b5b557f/axum-0.8.1/src/routing/mod.rs:300:21
    |
297 |     pub fn layer<L>(self, layer: L) -> Router<S>
    |            ----- required by a bound in this associated function
...
300 |         L::Service: Service<Request> + Clone + Send + Sync + 'static,
    |                     ^^^^^^^^^^^^^^^^ required by this bound in `Router::<S>::layer`

This seems to be the case because Axum 0.8 starts requiring Sync. This should be fixed by updating the trait implementation.