don't need 'static on F::Output [skip ci]

crates/polars-io/src/pl_async.rs

@@ -248,7 +248,7 @@ impl RuntimeManager {
     pub fn block_on_potential_spawn<F>(&'static self, future: F) -> F::Output
     where
         F: Future + Send,
-        F::Output: Send + 'static,
+        F::Output: Send,
     {
         let rayon_idx = POOL.current_thread_index();