refactor: update dependencies and code for latest ecosystem changes

- Update many dependencies to latest versions across all crates
- Switch from `once_cell::OnceCell` to `std::sync::OnceLock` where appropriate
- Update OAuth to use stateful `reqwest` for HTTP requests
- Fix Rodio backend to honor the requested sample format

discovery/src/server.rs

@@ -51,7 +51,7 @@ impl RequestHandler {
         Self {
             config,
             username: Mutex::new(None),
-            keys: DhLocalKeys::random(&mut rand::thread_rng()),
+            keys: DhLocalKeys::random(&mut rand::rng()),
             event_tx,
         }
     }