fix(napi): block_on type (#1911)

crates/napi/src/tokio_runtime.rs

@@ -65,9 +65,9 @@ where
 /// Runs a future to completion
 /// This is blocking, meaning that it pauses other execution until the future is complete,
 /// only use it when it is absolutely necessary, in other places use async functions instead.
-pub fn block_on<F>(fut: F) -> F::Output
+pub fn block_on<F, O>(fut: F) -> F::Output
 where
-  F: 'static + Send + Future<Output = ()>,
+  F: 'static + Send + Future<Output = O>,
 {
   RT.read().unwrap().as_ref().unwrap().block_on(fut)
 }