refactor: remove lazy_static crate

The `lazy_static` crate was superseded by the `once_cell` crate which
has been included in Rust's standard library since version `1.70`.
Remove the `lazy_static` dependency and refactor all use cases to use
`std::sync::OnceLock` instead.

Co-authored-by: Henrik Friedrichsen <henrik@affekt.org>

src/spotify_api.rs

@@ -94,7 +94,7 @@ impl WebApi {
             .as_ref()
         {
             channel.send(cmd).expect("can't send message to worker");
-            let token_option = ASYNC_RUNTIME.block_on(token_rx).unwrap();
+            let token_option = ASYNC_RUNTIME.get().unwrap().block_on(token_rx).unwrap();
             if let Some(token) = token_option {
                 *self.api.token.lock().expect("can't writelock api token") = Some(Token {
                     access_token: token.access_token,