Update axum requirement from 0.4 to 0.6

[dependabot]

Updates the requirements on axum to permit the latest version.

Release notes

Sourced from axum's releases.

axum - v0.6.0

Routing

• fixed: Nested routers are now allowed to have fallbacks (#1521):

  let api_router = Router::new()
      .route("/users", get(|| { ... }))
      .fallback(api_fallback);
  let app = Router::new()
  // this would panic in 0.5 but in 0.6 it just works
  //
  // requests starting with /api but not handled by api_router
  // will go to /api_fallback
  .nest("/api", api_router);

  The outer router's fallback will still apply if a nested router doesn't have its own fallback:

  // this time without a fallback
  let api_router = Router::new().route("/users", get(|| { ... }));
  let app = Router::new()
  .nest("/api", api_router)
  // api_fallback will inherit this fallback
  .fallback(app_fallback);

• breaking: The request /foo/ no longer matches /foo/*rest. If you want to match /foo/ you have to add a route specifically for that (#1086)

  For example:

  use axum::{Router, routing::get, extract::Path};
  let app = Router::new()
  // this will match /foo/bar/baz
  .route("/foo/*rest", get(handler))
  // this will match /foo/
  .route("/foo/", get(handler))
  // if you want /foo to match you must also add an explicit route for it
  .route("/foo", get(handler));
  async fn handler(
  // use an Option because /foo/ and /foo don't have any path params
  params: Option<Path<String>>,

... (truncated)

Commits

• 1b6780c axum 0.6 and friends 🎉 (#1570)
• 0b26411 Change Router::with_state and impl Service for Router\<()> (#1552)
• fde38f6 docs: Add axum-csrf-sync-pattern to ECOSYSTEM.md (#1567)
• 102d588 add showcase freedit (#1559)
• 6771729 Improve State and Router docs (#1543)
• 7d0bb28 Minor doc fixes (#1562)
• ddee1c1 docs: add how to use Arc<AppState> with the cookies examples (#1560)
• c7e696b provide links to axum-sessions and axum-login (#1553)
• 3ab3e5f Use http re-export in docs (#1554)
• 8d2fb36 Remove unused imports from doctest (#1551)
• Additional commits viewable in compare view

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